Bump version to 3.1.2

26-add-ios-target (#28 )
* Refactor: Modernize build and publishing workflow - Upgraded Kotlin from 1.7.20 to 1.9.20. - Upgraded JDK from 11 to 21 across all GitHub Actions workflows. - Replaced the legacy `maven-publish` plugin with `com.vanniktech.maven.publish` for simplified publishing to Maven Central. - Removed the `publishSnapshot.yml` workflow, as snapshot publishing is now managed by the new plugin. - Updated `publishRelease.yml` to use the `publishToMavenCentral` task and new secrets (`MAVEN_CENTRAL_USERNAME`, `MAVEN_CENTRAL_PASSWORD`). - Simplified `build.gradle.kts` by removing manual publishing and signing logic. - Set the JVM target to "21". - Bumped the project version to `3.1.1`. - Removed `js` targets and related configurations. - Added a new code style configuration file for the project (`.idea/codeStyles/Project.xml`). * fix: Add JavaScript targets - Added JS (IR) targets (`browser` and `nodejs`) to the Kotlin Multiplatform configuration for publishing. * Improve README and document new publishing workflow - Expanded the project description to highlight key features like Kotlin Multiplatform support, traversal iterators, DSL, and utility functions. - Added a new "Installation" section with instructions for Gradle (Kotlin/Groovy) and Maven. - Added a "Traversal and utilities" section to demonstrate usage of iterators and helper functions. - Replaced the old publishing documentation with updated instructions for publishing to Maven Central via the Central Portal. - Detailed the two publishing methods: automatically via GitHub Actions on release and manually via local Gradle commands. - Clarified required secrets and environment variables for the new publishing process.
2025-10-31 08:53:41 +01:00 · 2025-10-14 18:47:18 +02:00 · 2025-10-14 18:46:05 +02:00 · 2025-09-09 09:12:20 +02:00 · 2025-09-05 11:17:54 +02:00 · 2025-09-05 11:14:44 +02:00
72 changed files with 3133 additions and 1237 deletions
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,86 +0,0 @@
 version: 2.1
 jobs:
  build:
    working_directory: ~/code
    docker:
      - image: circleci/android:api-29
    environment:
      JVM_OPTS: -Xmx3200m
    steps:
      - checkout
      - restore_cache:
          key: jars-{{ checksum "build.gradle" }}-{{ checksum  "app/build.gradle" }}
      - run:
          name: Download Dependencies
          command: ./gradlew androidDependencies
      - save_cache:
          paths:
            - ~/.gradle
          key: jars-{{ checksum "build.gradle" }}-{{ checksum  "app/build.gradle" }}
  tests:
    working_directory: ~/code
    docker:
      - image: circleci/android:api-29
    environment:
      JVM_OPTS: -Xmx3200m
    steps:
      - checkout
      - restore_cache:
          key: jars-{{ checksum "build.gradle" }}-{{ checksum  "app/build.gradle" }}
      - store_artifacts:
          path: app/build/reports
          destination: reports
      - run:
          name: Run Lint Test
          command: ./gradlew lint
      - run:
          name: Run Tests
          command: ./gradlew lint test
      - store_artifacts:
          path: app/build/reports
          destination: reports
      - store_test_results:
          path: app/build/test-results
  deploy:
    working_directory: ~/code
    docker:
      - image: circleci/android:api-29
    environment:
      JVM_OPTS: -Xmx3200m
    steps:
      - checkout
      - restore_cache:
          key: jars-{{ checksum "build.gradle" }}-{{ checksum  "app/build.gradle" }}
      - run:
          name: Build Library
          command: ./gradlew :treedatastructure:assembleRelease
      - run:
          name: Export key
          command: |
            mkdir treedatastructure/maven
            echo ${GPG_KEY_CONTENTS} | base64 -d --ignore-garbage > treedatastructure/maven/secret.gpg
      - run:
          name: Staging
          command: ./gradlew :treedatastructure:publishReleasePublicationToSonatypeRepository
      - run:
          name: Release Library
          command: ./gradlew closeAndReleaseRepository
 workflows:
  version: 2.1
  build-and-deploy:
    jobs:
      - build:
          filters:  # required since `deploy` has tag filters AND requires `build`
            tags:
              only: /.*/
      - deploy:
          requires:
            - build
          filters:
            tags:
              only: /v[0-9]{1,3}\.[0-9]{1,3}\.?[0-9]{0,3}/
            branches:
              ignore: /.*/
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -0,0 +1,11 @@
 # To get started with Dependabot version updates, you'll need to specify which
 # package ecosystems to update and where the package manifests are located.
 # Please see the documentation for all configuration options:
 # https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
 version: 2
 updates:
  - package-ecosystem: "" # See documentation for possible values
    directory: "/" # Location of package manifests
    schedule:
      interval: "weekly"
--- a/.github/workflows/publishRelease.yml
+++ b/.github/workflows/publishRelease.yml
@@ -0,0 +1,36 @@
 name: Publish
 on:
  release:
    # We'll run this workflow when a new GitHub release is created
    types: [released]
 jobs:
  test:
    uses: ./.github/workflows/test.yml
    secrets: inherit
  publish:
    needs: test
    name: Publish Production
    environment: production
    runs-on: ubuntu-latest
    steps:
      - name: Check out code
        uses: actions/checkout@v2
      - name: Set up JDK 21
        uses: actions/setup-java@v4
        with:
          distribution: temurin
          java-version: '21'
        # Runs upload, and then closes & releases the repository
      - name: Publish to MavenCentral
        run: ./gradlew publishToMavenCentral
        env:
          ORG_GRADLE_PROJECT_mavenCentralUsername: ${{ secrets.MAVEN_CENTRAL_USERNAME }}
          ORG_GRADLE_PROJECT_mavenCentralPassword: ${{ secrets.MAVEN_CENTRAL_PASSWORD }}
          ORG_GRADLE_PROJECT_signingInMemoryKey: ${{ secrets.SIGNING_KEY }}
          ORG_GRADLE_PROJECT_signingInMemoryKeyPassword: ${{ secrets.SIGNING_PASSWORD }}
          SNAPSHOT: false
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -0,0 +1,23 @@
 name: Test
 on:
  push:
    branches-ignore: [master]
  workflow_call:
 jobs:
  build:
    name: Run unit tests
    runs-on: ubuntu-latest
    steps:
      - name: Check out code
        uses: actions/checkout@v2
      - name: Set up JDK 21
        uses: actions/setup-java@v4
        with:
          distribution: temurin
          java-version: '21'
        # Builds the release artifacts of the library
      - name: Test
        run: ./gradlew cleanJvmTest jvmTest
--- a/.gitignore
+++ b/.gitignore
@@ -12,3 +12,7 @@
 /captures
 .externalNativeBuild
 .cxx
 /.idea/.name
 /.idea/compiler.xml
 /.idea/jarRepositories.xml
 /.idea/deploymentTargetDropDown.xml
--- a/.idea/.gitignore
+++ b/.idea/.gitignore
@@ -0,0 +1,4 @@
 # Default ignored files
 /shelf/
 /workspace.xml
 artifacts
--- a/.idea/AndroidProjectSystem.xml
+++ b/.idea/AndroidProjectSystem.xml
@@ -0,0 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
  <component name="AndroidProjectSystem">
    <option name="providerId" value="com.android.tools.idea.GradleProjectSystem" />
  </component>
 </project>
--- a/.idea/codeStyles/Project.xml
+++ b/.idea/codeStyles/Project.xml
@@ -1,123 +1,43 @@
 <component name="ProjectCodeStyleConfiguration">
  <code_scheme name="Project" version="173">
    <JavaCodeStyleSettings>
      <option name="IMPORT_LAYOUT_TABLE">
        <value>
          <package name="" withSubpackages="true" static="false" module="true" />
          <package name="android" withSubpackages="true" static="true" />
          <package name="androidx" withSubpackages="true" static="true" />
          <package name="com" withSubpackages="true" static="true" />
          <package name="junit" withSubpackages="true" static="true" />
          <package name="net" withSubpackages="true" static="true" />
          <package name="org" withSubpackages="true" static="true" />
          <package name="java" withSubpackages="true" static="true" />
          <package name="javax" withSubpackages="true" static="true" />
          <package name="" withSubpackages="true" static="true" />
          <emptyLine />
          <package name="android" withSubpackages="true" static="false" />
          <emptyLine />
          <package name="androidx" withSubpackages="true" static="false" />
          <emptyLine />
          <package name="com" withSubpackages="true" static="false" />
          <emptyLine />
          <package name="junit" withSubpackages="true" static="false" />
          <emptyLine />
          <package name="net" withSubpackages="true" static="false" />
          <emptyLine />
          <package name="org" withSubpackages="true" static="false" />
          <emptyLine />
          <package name="java" withSubpackages="true" static="false" />
          <emptyLine />
          <package name="javax" withSubpackages="true" static="false" />
          <emptyLine />
          <package name="" withSubpackages="true" static="false" />
          <emptyLine />
        </value>
      </option>
    </JavaCodeStyleSettings>
    <JetCodeStyleSettings>
      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
    </JetCodeStyleSettings>
    <MarkdownNavigatorCodeStyleSettings>
      <option name="RIGHT_MARGIN" value="72" />
    </MarkdownNavigatorCodeStyleSettings>
    <codeStyleSettings language="XML">
      <indentOptions>
        <option name="CONTINUATION_INDENT_SIZE" value="4" />
      </indentOptions>
      <arrangement>
        <rules>
          <section>
            <rule>
              <match>
                <AND>
                  <NAME>xmlns:android</NAME>
                  <XML_ATTRIBUTE />
                  <XML_NAMESPACE>^$</XML_NAMESPACE>
                </AND>
              </match>
            </rule>
          </section>
          <section>
            <rule>
              <match>
                <AND>
                  <NAME>xmlns:.*</NAME>
                  <XML_ATTRIBUTE />
                  <XML_NAMESPACE>^$</XML_NAMESPACE>
                </AND>
              </match>
              <order>BY_NAME</order>
            </rule>
          </section>
          <section>
            <rule>
              <match>
                <AND>
                  <NAME>.*:id</NAME>
                  <XML_ATTRIBUTE />
                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
                </AND>
              </match>
            </rule>
          </section>
          <section>
            <rule>
              <match>
                <AND>
                  <NAME>.*:name</NAME>
                  <XML_ATTRIBUTE />
                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
                </AND>
              </match>
            </rule>
          </section>
          <section>
            <rule>
              <match>
                <AND>
                  <NAME>name</NAME>
                  <XML_ATTRIBUTE />
                  <XML_NAMESPACE>^$</XML_NAMESPACE>
                </AND>
              </match>
            </rule>
          </section>
          <section>
            <rule>
              <match>
                <AND>
                  <NAME>style</NAME>
                  <XML_ATTRIBUTE />
                  <XML_NAMESPACE>^$</XML_NAMESPACE>
                </AND>
              </match>
            </rule>
          </section>
          <section>
            <rule>
              <match>
                <AND>
                  <NAME>.*</NAME>
                  <XML_ATTRIBUTE />
                  <XML_NAMESPACE>^$</XML_NAMESPACE>
                </AND>
              </match>
              <order>BY_NAME</order>
            </rule>
          </section>
          <section>
            <rule>
              <match>
                <AND>
                  <NAME>.*</NAME>
                  <XML_ATTRIBUTE />
                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
                </AND>
              </match>
              <order>ANDROID_ATTRIBUTE_ORDER</order>
            </rule>
          </section>
          <section>
            <rule>
              <match>
                <AND>
                  <NAME>.*</NAME>
                  <XML_ATTRIBUTE />
                  <XML_NAMESPACE>.*</XML_NAMESPACE>
                </AND>
              </match>
              <order>BY_NAME</order>
            </rule>
          </section>
        </rules>
      </arrangement>
    </codeStyleSettings>
    <codeStyleSettings language="kotlin">
      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
    </codeStyleSettings>
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -1,19 +1,17 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
  <component name="GradleMigrationSettings" migrationVersion="1" />
  <component name="GradleSettings">
    <option name="linkedExternalProjectsSettings">
      <GradleProjectSettings>
-        <option name="distributionType" value="DEFAULT_WRAPPED" />
+        <option name="testRunner" value="CHOOSE_PER_TEST" />
        <option name="externalProjectPath" value="$PROJECT_DIR$" />
        <option name="gradleJvm" value="#GRADLE_LOCAL_JAVA_HOME" />
        <option name="modules">
          <set>
            <option value="$PROJECT_DIR$" />
            <option value="$PROJECT_DIR$/app" />
            <option value="$PROJECT_DIR$/treedatastructure" />
          </set>
        </option>
        <option name="resolveModulePerSourceSet" value="false" />
        <option name="testRunner" value="PLATFORM" />
      </GradleProjectSettings>
    </option>
  </component>
--- a/.idea/inspectionProfiles/Project_Default.xml
+++ b/.idea/inspectionProfiles/Project_Default.xml
@@ -0,0 +1,6 @@
 <component name="InspectionProjectProfileManager">
  <profile version="1.0">
    <option name="myName" value="Project Default" />
    <inspection_tool class="ReplaceUntilWithRangeUntil" enabled="true" level="WEAK WARNING" enabled_by_default="true" />
  </profile>
 </component>
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,9 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
-    <output url="file://$PROJECT_DIR$/build/classes" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="jbr-21" project-jdk-type="JavaSDK">
-  </component>
+    <output url="file://$PROJECT_DIR$/out" />
  <component name="ProjectType">
    <option name="id" value="Android" />
  </component>
 </project>
--- a/.idea/runConfigurations.xml
+++ b/.idea/runConfigurations.xml
@@ -3,9 +3,14 @@
  <component name="RunConfigurationProducerService">
    <option name="ignoredProducers">
      <set>
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.AllInPackageGradleConfigurationProducer" />
+        <option value="com.intellij.execution.junit.AbstractAllInDirectoryConfigurationProducer" />
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestClassGradleConfigurationProducer" />
+        <option value="com.intellij.execution.junit.AllInPackageConfigurationProducer" />
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestMethodGradleConfigurationProducer" />
+        <option value="com.intellij.execution.junit.PatternConfigurationProducer" />
        <option value="com.intellij.execution.junit.TestInClassConfigurationProducer" />
        <option value="com.intellij.execution.junit.UniqueIdConfigurationProducer" />
        <option value="com.intellij.execution.junit.testDiscovery.JUnitTestDiscoveryConfigurationProducer" />
        <option value="org.jetbrains.kotlin.idea.junit.KotlinJUnitRunConfigurationProducer" />
        <option value="org.jetbrains.kotlin.idea.junit.KotlinPatternConfigurationProducer" />
      </set>
    </option>
  </component>
--- a/.idea/studiobot.xml
+++ b/.idea/studiobot.xml
@@ -0,0 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
  <component name="StudioBotProjectSettings">
    <option name="shareContext" value="OptedIn" />
  </component>
 </project>
--- a/README.md
+++ b/README.md
@@ -1,9 +1,40 @@
 # Tree (Data Structure)
 [![maven](https://img.shields.io/maven-central/v/com.github.adriankuta/tree-structure?style=plastic)](https://mvnrepository.com/artifact/com.github.adriankuta/tree-structure)
-[![License: MIT](https://img.shields.io/github/license/AdrianKuta/Tree-Data-Structure?style=plastic)](https://github.com/AdrianKuta/Design-Patterns-Kotlin/blob/master/LICENSE)
+[![License: MIT](https://img.shields.io/github/license/AdrianKuta/Tree-Data-Structure?style=plastic)](https://github.com/AdrianKuta/Tree-Data-Structure/blob/master/LICENSE)
-[![CircleCI](https://img.shields.io/circleci/build/github/AdrianKuta/Tree-Data-Structure/master?label=CircleCI&style=plastic&logo=circleci)](https://circleci.com/gh/AdrianKuta/Tree-Data-Structure)
+[![Publish](https://github.com/AdrianKuta/Tree-Data-Structure/actions/workflows/publishRelease.yml/badge.svg)](https://github.com/AdrianKuta/Tree-Data-Structure/actions/workflows/publishRelease.yml)
-Simple implementation to store object in tree structure. Method `toString()` is overrided to provide nice tree view in logs.
+Lightweight Kotlin Multiplatform tree data structure for Kotlin and Java. Includes a small DSL, multiple traversal iterators, and pretty-print support.
 - Kotlin Multiplatform (JVM, JS, iOS, and Native host)
 - Pre-order, Post-order, and Level-order iteration
 - Simple DSL: tree { child(...) }
 - Utilities: nodeCount(), height(), depth(), path(), prettyString(), clear(), removeChild()
 ## Installation
 Gradle (Kotlin DSL):
 ```kotlin
 // commonMain for KMP projects, or any sourceSet/module where you need it
 dependencies {
    implementation("com.github.adriankuta:tree-structure:3.1.1") // see badge above for the latest version
 }
 ```
 Gradle (Groovy):
 ```groovy
 dependencies {
    implementation "com.github.adriankuta:tree-structure:3.1.1" // see badge above for the latest
 }
 ```
 Maven:
 ```xml
 <dependency>
  <groupId>com.github.adriankuta</groupId>
  <artifactId>tree-structure</artifactId>
  <version>3.1.1</version>
 </dependency>
 ```
 ## Usage
@@ -22,22 +53,18 @@ val poland = TreeNode("Poland")
 val france = TreeNode("France")
 europe.addChild(poland)
 europe.addChild(france)
-println(root)
+println(root.prettyString())
 ```
-**Pretty Kotlin**
+**Pretty Kotlin (DSL)**
 ```kotlin
-val root =
+val root = tree("World") {
-    tree("World") {
+    child("North America") { child("USA") }
-        child("North America") {
+    child("Europe") {
-            child("USA")
+        child("Poland")
-        }
+        child("Germany")
        child("Europe") {
            child("Poland")
            child("Germany")
        }
    }
 }
 ```
 **Java**
@@ -55,11 +82,10 @@ TreeNode<String> poland = new TreeNode<>("Poland");
 TreeNode<String> france = new TreeNode<>("France");
 europe.addChild(poland);
 europe.addChild(france);
-System.out.println(root);
+System.out.println(root.prettyString());
 ```
-*Output:*
+Output:
 ```
 World
 ├── North America
@@ -69,10 +95,58 @@ World
    └── France
 ```
 ### Traversal and utilities
 ```kotlin
 val root = TreeNode("root")
 // ... build your tree
-## Download
+// Choose iteration order (default is PreOrder)
 root.treeIterator = TreeNodeIterators.PostOrder
 for (node in root) println(node.value)
-    implementation "com.github.adriankuta:tree-structure:$latest_versions"
+// Utilities
 root.nodeCount()   // number of descendants
 root.height()      // longest path to a leaf (in edges)
 root.depth()       // distance from current node to the root
 val path = root.path(root.children.first()) // nodes from descendant up to root
 // Mutations
 val child = root.children.first()
 root.removeChild(child)
 root.clear()       // remove entire subtree
 ```
 ## Publishing to Maven Central (central.sonatype.com)
 This project is configured to publish artifacts to Maven Central via the Sonatype Central Portal.
 There are two supported ways to publish:
 1) Via GitHub Actions (recommended)
 - Create a GitHub Release (tag) in this repository. When a release is published, the workflow .github/workflows/publishRelease.yml runs automatically.
 - The workflow uses the Gradle task publishToMavenCentral to upload artifacts through the Central Portal.
 - Make sure these repository secrets are configured in GitHub:
  - MAVEN_CENTRAL_USERNAME — Your Sonatype Central username (not email).
  - MAVEN_CENTRAL_PASSWORD — Your Sonatype Central password or a token from central.sonatype.com.
  - SIGNING_KEY — ASCII‑armored GPG private key (exported, single line; for in‑memory signing).
  - SIGNING_PASSWORD — Passphrase for the key above.
 - The workflow uses JDK 21 and publishes the version defined in build.gradle.kts.
 2) Locally via Gradle
 - Ensure you have a Sonatype Central account and that the groupId com.github.adriankuta is verified in central.sonatype.com (Namespace Rules → Verify).
 - Export the same credentials/signing values as environment variables or pass them as Gradle properties:
  - ORG_GRADLE_PROJECT_mavenCentralUsername
  - ORG_GRADLE_PROJECT_mavenCentralPassword
  - ORG_GRADLE_PROJECT_signingInMemoryKey
  - ORG_GRADLE_PROJECT_signingInMemoryKeyPassword
 - Then run:
  - ./gradlew publishToMavenCentral
 - For snapshot publishing, set -Psnapshot=true (the version is derived from PUBLISH_VERSION with -SNAPSHOT).
 Notes
 - Publishing is powered by the com.vanniktech.maven.publish Gradle plugin and Sonatype Central Portal (no legacy Nexus staging URLs needed).
 - The plugin is configured to sign all publications. Coordinates and POM metadata are defined in build.gradle.kts.
 - If using the combined task is preferred, you can also run publishAndReleaseToMavenCentral when automatic release is enabled; this repository currently uploads with publishToMavenCentral from CI.
 ## License
@@ -97,3 +171,5 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 ---
--- a/_config.yml
+++ b/_config.yml
@@ -1,3 +0,0 @@
 theme: jekyll-theme-minimal
 title: Tree Data Structure
 logo: images/console_output.png
--- a/app/.gitignore
+++ b/app/.gitignore
@@ -1 +0,0 @@
 /build
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,35 +0,0 @@
 apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
 android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "com.github.adriankuta.treedatastructure"
        minSdkVersion 15
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
 }
 dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.core:core-ktx:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
 }
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -1,21 +0,0 @@
 # Add project specific ProGuard rules here.
 # You can control the set of applied configuration files using the
 # proguardFiles setting in build.gradle.
 #
 # For more details, see
 #   http://developer.android.com/guide/developing/tools/proguard.html
 # If your project uses WebView with JS, uncomment the following
 # and specify the fully qualified class name to the JavaScript interface
 # class:
 #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
 #   public *;
 #}
 # Uncomment this to preserve the line number information for
 # debugging stack traces.
 #-keepattributes SourceFile,LineNumberTable
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
 #-renamesourcefileattribute SourceFile
--- a/app/src/androidTest/java/com/github/adriankuta/treedatastructure/ExampleInstrumentedTest.kt
+++ b/app/src/androidTest/java/com/github/adriankuta/treedatastructure/ExampleInstrumentedTest.kt
@@ -1,24 +0,0 @@
 package com.github.adriankuta.treedatastructure
 import androidx.test.platform.app.InstrumentationRegistry
 import androidx.test.ext.junit.runners.AndroidJUnit4
 import org.junit.Test
 import org.junit.runner.RunWith
 import org.junit.Assert.*
 /**
 * Instrumented test, which will execute on an Android device.
 *
 * See [testing documentation](http://d.android.com/tools/testing).
 */
@RunWith(AndroidJUnit4::class)
 class ExampleInstrumentedTest {
    @Test
    fun useAppContext() {
        // Context of the app under test.
        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
        assertEquals("com.github.adriankuta.treedatastructure", appContext.packageName)
    }
 }
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,21 +0,0 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.github.adriankuta.treedatastructure">
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
 </manifest>
--- a/app/src/main/java/com/github/adriankuta/treedatastructure/MainActivity.kt
+++ b/app/src/main/java/com/github/adriankuta/treedatastructure/MainActivity.kt
@@ -1,12 +0,0 @@
 package com.github.adriankuta.treedatastructure
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
 class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }
 }
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,34 +0,0 @@
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:aapt="http://schemas.android.com/aapt"
    android:width="108dp"
    android:height="108dp"
    android:viewportWidth="108"
    android:viewportHeight="108">
    <path
        android:fillType="evenOdd"
        android:pathData="M32,64C32,64 38.39,52.99 44.13,50.95C51.37,48.37 70.14,49.57 70.14,49.57L108.26,87.69L108,109.01L75.97,107.97L32,64Z"
        android:strokeWidth="1"
        android:strokeColor="#00000000">
        <aapt:attr name="android:fillColor">
            <gradient
                android:endX="78.5885"
                android:endY="90.9159"
                android:startX="48.7653"
                android:startY="61.0927"
                android:type="linear">
                <item
                    android:color="#44000000"
                    android:offset="0.0" />
                <item
                    android:color="#00000000"
                    android:offset="1.0" />
            </gradient>
        </aapt:attr>
    </path>
    <path
        android:fillColor="#FFFFFF"
        android:fillType="nonZero"
        android:pathData="M66.94,46.02L66.94,46.02C72.44,50.07 76,56.61 76,64L32,64C32,56.61 35.56,50.11 40.98,46.06L36.18,41.19C35.45,40.45 35.45,39.3 36.18,38.56C36.91,37.81 38.05,37.81 38.78,38.56L44.25,44.05C47.18,42.57 50.48,41.71 54,41.71C57.48,41.71 60.78,42.57 63.68,44.05L69.11,38.56C69.84,37.81 70.98,37.81 71.71,38.56C72.44,39.3 72.44,40.45 71.71,41.19L66.94,46.02ZM62.94,56.92C64.08,56.92 65,56.01 65,54.88C65,53.76 64.08,52.85 62.94,52.85C61.8,52.85 60.88,53.76 60.88,54.88C60.88,56.01 61.8,56.92 62.94,56.92ZM45.06,56.92C46.2,56.92 47.13,56.01 47.13,54.88C47.13,53.76 46.2,52.85 45.06,52.85C43.92,52.85 43,53.76 43,54.88C43,56.01 43.92,56.92 45.06,56.92Z"
        android:strokeWidth="1"
        android:strokeColor="#00000000" />
 </vector>
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,170 +0,0 @@
 <?xml version="1.0" encoding="utf-8"?>
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="108dp"
    android:height="108dp"
    android:viewportWidth="108"
    android:viewportHeight="108">
    <path
        android:fillColor="#008577"
        android:pathData="M0,0h108v108h-108z" />
    <path
        android:fillColor="#00000000"
        android:pathData="M9,0L9,108"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M19,0L19,108"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M29,0L29,108"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M39,0L39,108"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M49,0L49,108"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M59,0L59,108"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M69,0L69,108"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M79,0L79,108"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M89,0L89,108"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M99,0L99,108"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M0,9L108,9"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M0,19L108,19"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M0,29L108,29"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M0,39L108,39"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M0,49L108,49"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M0,59L108,59"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M0,69L108,69"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M0,79L108,79"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M0,89L108,89"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M0,99L108,99"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M19,29L89,29"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M19,39L89,39"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M19,49L89,49"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M19,59L89,59"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M19,69L89,69"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M19,79L89,79"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M29,19L29,89"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M39,19L39,89"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M49,19L49,89"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M59,19L59,89"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M69,19L69,89"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
    <path
        android:fillColor="#00000000"
        android:pathData="M79,19L79,89"
        android:strokeWidth="0.8"
        android:strokeColor="#33FFFFFF" />
 </vector>
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,18 +0,0 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
 </androidx.constraintlayout.widget.ConstraintLayout>
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -1,5 +0,0 @@
 <?xml version="1.0" encoding="utf-8"?>
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
    <background android:drawable="@drawable/ic_launcher_background" />
    <foreground android:drawable="@drawable/ic_launcher_foreground" />
 </adaptive-icon>
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -1,5 +0,0 @@
 <?xml version="1.0" encoding="utf-8"?>
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
    <background android:drawable="@drawable/ic_launcher_background" />
    <foreground android:drawable="@drawable/ic_launcher_foreground" />
 </adaptive-icon>
--- a/app/src/main/res/mipmap-hdpi/ic_launcher.png
+++ b/app/src/main/res/mipmap-hdpi/ic_launcher.png
--- a/app/src/main/res/mipmap-hdpi/ic_launcher_round.png
+++ b/app/src/main/res/mipmap-hdpi/ic_launcher_round.png
--- a/app/src/main/res/mipmap-mdpi/ic_launcher.png
+++ b/app/src/main/res/mipmap-mdpi/ic_launcher.png
--- a/app/src/main/res/mipmap-mdpi/ic_launcher_round.png
+++ b/app/src/main/res/mipmap-mdpi/ic_launcher_round.png
--- a/app/src/main/res/mipmap-xhdpi/ic_launcher.png
+++ b/app/src/main/res/mipmap-xhdpi/ic_launcher.png
--- a/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png
+++ b/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png
--- a/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
+++ b/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
--- a/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png
+++ b/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png
--- a/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
+++ b/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
--- a/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png
+++ b/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -1,6 +0,0 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
    <color name="colorPrimary">#008577</color>
    <color name="colorPrimaryDark">#00574B</color>
    <color name="colorAccent">#D81B60</color>
 </resources>
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +0,0 @@
 <resources>
    <string name="app_name">Tree Data Structure</string>
 </resources>
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -1,11 +0,0 @@
 <resources>
    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>
 </resources>
--- a/app/src/test/java/com/github/adriankuta/treedatastructure/ExampleUnitTest.kt
+++ b/app/src/test/java/com/github/adriankuta/treedatastructure/ExampleUnitTest.kt
@@ -1,17 +0,0 @@
 package com.github.adriankuta.treedatastructure
 import org.junit.Test
 import org.junit.Assert.*
 /**
 * Example local unit test, which will execute on the development machine (host).
 *
 * See [testing documentation](http://d.android.com/tools/testing).
 */
 class ExampleUnitTest {
    @Test
    fun addition_isCorrect() {
        assertEquals(4, 2 + 2)
    }
 }
--- a/build.gradle
+++ b/build.gradle
@@ -1,31 +0,0 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
    ext.kotlin_version = '1.3.61'
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.3'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath "io.codearte.gradle.nexus:gradle-nexus-staging-plugin:0.21.2"
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
 }
 allprojects {
    repositories {
        google()
        jcenter()
    }
 }
 task clean(type: Delete) {
    delete rootProject.buildDir
 }
 apply plugin: 'io.codearte.nexus-staging'
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -0,0 +1,115 @@
 import org.jetbrains.kotlin.konan.properties.Properties
 plugins {
    kotlin("multiplatform") version "1.9.20"
    id("org.jetbrains.dokka") version "1.9.20"
    id("com.vanniktech.maven.publish") version "0.34.0"
    signing
 }
 val PUBLISH_GROUP_ID = "com.github.adriankuta"
 val PUBLISH_ARTIFACT_ID = "tree-structure"    // base artifact; KMP will add -jvm, -ios*, etc.
 val PUBLISH_VERSION = "3.1.2"
 val snapshot: String? by project
 group = PUBLISH_GROUP_ID
 version = if (snapshot.toBoolean()) "$PUBLISH_VERSION-SNAPSHOT" else PUBLISH_VERSION
 mavenPublishing {
    // Central Portal + auto release when we call publishAndReleaseToMavenCentral
    publishToMavenCentral(automaticRelease = false)
    signAllPublications()
    coordinates(PUBLISH_GROUP_ID, PUBLISH_ARTIFACT_ID, version.toString())
    pom {
        name.set("Tree Data Structure")
        description.set("Simple implementation to store object in tree structure.")
        url.set("https://github.com/AdrianKuta/Tree-Data-Structure")
        licenses {
            license {
                name.set("MIT License")
                url.set("https://opensource.org/licenses/MIT")
                distribution.set("repo")
            }
        }
        developers {
            developer {
                id.set("AdrianKuta")
                name.set("Adrian Kuta")
                email.set("adrian.kuta93@gmail.com")
            }
        }
        scm {
            url.set("https://github.com/AdrianKuta/Tree-Data-Structure")
            connection.set("scm:git:https://github.com/AdrianKuta/Tree-Data-Structure.git")
            developerConnection.set("scm:git:ssh://git@github.com/AdrianKuta/Tree-Data-Structure.git")
        }
    }
 }
 // No legacy publishing {} block or s01 repos — Central Portal handles it.
 repositories {
    mavenCentral()
 }
 java {
    toolchain {
        languageVersion.set(JavaLanguageVersion.of(21))
    }
 }
 kotlin {
    jvmToolchain(21);
    jvm {
        compilations.all {
            kotlinOptions {
                jvmTarget = "21"   // <- was "1.8"
            }
        }
    }
    // JS targets (IR) for publishing
    js(IR) {
        browser()
        nodejs()
    }
    // iOS targets
    iosX64()
    iosArm64()
    iosSimulatorArm64()
    // Native host target
    val hostOs = System.getProperty("os.name")
    val isMingwX64 = hostOs.startsWith("Windows")
    val nativeTarget = when {
        hostOs == "Mac OS X" -> macosX64("native")
        hostOs == "Linux" -> linuxX64("native")
        isMingwX64 -> mingwX64("native")
        else -> throw GradleException("Host OS is not supported in Kotlin/Native.")
    }
    sourceSets {
        val commonMain by getting
        val commonTest by getting { dependencies { implementation(kotlin("test")) } }
        val jvmMain by getting { dependencies { implementation(kotlin("script-runtime")) } }
        val jvmTest by getting
        val jsMain by getting
        val jsTest by getting
        val nativeMain by getting
        val nativeTest by getting
        // Shared iOS source sets
        val iosMain by creating { dependsOn(commonMain) }
        val iosTest by creating { dependsOn(commonTest) }
        val iosX64Main by getting { dependsOn(iosMain) }
        val iosArm64Main by getting { dependsOn(iosMain) }
        val iosSimulatorArm64Main by getting { dependsOn(iosMain) }
        val iosX64Test by getting { dependsOn(iosTest) }
        val iosArm64Test by getting { dependsOn(iosTest) }
        val iosSimulatorArm64Test by getting { dependsOn(iosTest) }
    }
 }
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,21 +1,2 @@
 # Project-wide Gradle settings.
 # IDE (e.g. Android Studio) users:
 # Gradle settings configured through the IDE *will override*
 # any settings specified in this file.
 # For more details on how to configure your build environment visit
 # http://www.gradle.org/docs/current/userguide/build_environment.html
 # Specifies the JVM arguments used for the daemon process.
 # The setting is particularly useful for tweaking memory settings.
 org.gradle.jvmargs=-Xmx1536m
 # When configured, Gradle will run in incubating parallel mode.
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
 # org.gradle.parallel=true
 # AndroidX package structure to make it clearer which packages are bundled with the
 # Android operating system, and which are packaged with your app's APK
 # https://developer.android.com/topic/libraries/support-library/androidx-rn
 android.useAndroidX=true
 # Automatically convert third-party libraries to use AndroidX
 android.enableJetifier=true
 # Kotlin code style for this project: "official" or "obsolete":
 kotlin.code.style=official
 kotlin.js.compiler=ir
--- a/gradle/wrapper/gradle-wrapper.jar
+++ b/gradle/wrapper/gradle-wrapper.jar
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,7 @@
 #Wed Jan 08 12:28:15 CET 2020
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
 distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
--- a/309
+++ b/309
@@ -1,78 +1,127 @@
-#!/usr/bin/env sh
+#!/bin/sh
 #
 # Copyright © 2015-2021 the original authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #      https://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
 ##############################################################################
-##
+#
-##  Gradle start up script for UN*X
+#   Gradle start up script for POSIX generated by Gradle.
-##
+#
 #   Important for running:
 #
 #   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
 #       noncompliant, but you have some other compliant shell such as ksh or
 #       bash, then to run this script, type that shell name before the whole
 #       command line, like:
 #
 #           ksh Gradle
 #
 #       Busybox and similar reduced shells will NOT work, because this script
 #       requires all of these POSIX shell features:
 #         * functions;
 #         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
 #           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
 #         * compound commands having a testable exit status, especially «case»;
 #         * various built-in commands including «command», «set», and «ulimit».
 #
 #   Important for patching:
 #
 #   (2) This script targets any POSIX shell, so it avoids extensions provided
 #       by Bash, Ksh, etc; in particular arrays are avoided.
 #
 #       The "traditional" practice of packing multiple parameters into a
 #       space-separated string is a well documented source of bugs and security
 #       problems, so this is (mostly) avoided, by progressively accumulating
 #       options in "$@", and eventually passing that to Java.
 #
 #       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
 #       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
 #       see the in-line comments for details.
 #
 #       There are tweaks for specific operating systems such as AIX, CygWin,
 #       Darwin, MinGW, and NonStop.
 #
 #   (3) This script is generated from the Groovy template
 #       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
 #       within the Gradle project.
 #
 #       You can find Gradle at https://github.com/gradle/gradle/.
 #
 ##############################################################################
 # Attempt to set APP_HOME
 # Resolve links: $0 may be a link
-PRG="$0"
+app_path=$0
-# Need this for relative symlinks.
+
-while [ -h "$PRG" ] ; do
+# Need this for daisy-chained symlinks.
-    ls=`ls -ld "$PRG"`
+while
-    link=`expr "$ls" : '.*-> \(.*\)$'`
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
-    if expr "$link" : '/.*' > /dev/null; then
+    [ -h "$app_path" ]
-        PRG="$link"
+do
-    else
+    ls=$( ls -ld "$app_path" )
-        PRG=`dirname "$PRG"`"/$link"
+    link=${ls#*' -> '}
-    fi
+    case $link in             #(
      /*)   app_path=$link ;; #(
      *)    app_path=$APP_HOME$link ;;
    esac
 done
 SAVED="`pwd`"
 cd "`dirname \"$PRG\"`/" >/dev/null
 APP_HOME="`pwd -P`"
 cd "$SAVED" >/dev/null
-APP_NAME="Gradle"
+# This is normally unused
-APP_BASE_NAME=`basename "$0"`
+# shellcheck disable=SC2034
-
+APP_BASE_NAME=${0##*/}
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
-DEFAULT_JVM_OPTS=""
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
 # Use the maximum available, or set MAX_FD != -1 to use that value.
-MAX_FD="maximum"
+MAX_FD=maximum
 warn () {
    echo "$*"
-}
+} >&2
 die () {
    echo
    echo "$*"
    echo
    exit 1
-}
+} >&2
 # OS specific support (must be 'true' or 'false').
 cygwin=false
 msys=false
 darwin=false
 nonstop=false
-case "`uname`" in
+case "$( uname )" in                #(
-  CYGWIN* )
+  CYGWIN* )         cygwin=true  ;; #(
-    cygwin=true
+  Darwin* )         darwin=true  ;; #(
-    ;;
+  MSYS* | MINGW* )  msys=true    ;; #(
-  Darwin* )
+  NONSTOP* )        nonstop=true ;;
    darwin=true
    ;;
  MINGW* )
    msys=true
    ;;
  NONSTOP* )
    nonstop=true
    ;;
 esac
 CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
 # Determine the Java command to use to start the JVM.
 if [ -n "$JAVA_HOME" ] ; then
    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
        # IBM's JDK on AIX uses strange locations for the executables
-        JAVACMD="$JAVA_HOME/jre/sh/java"
+        JAVACMD=$JAVA_HOME/jre/sh/java
    else
-        JAVACMD="$JAVA_HOME/bin/java"
+        JAVACMD=$JAVA_HOME/bin/java
    fi
    if [ ! -x "$JAVACMD" ] ; then
        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
@@ -81,92 +130,120 @@ Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
    fi
 else
-    JAVACMD="java"
+    JAVACMD=java
-    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+    if ! command -v java >/dev/null 2>&1
    then
        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
    fi
 fi
 # Increase the maximum file descriptors if we can.
-if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
-    MAX_FD_LIMIT=`ulimit -H -n`
+    case $MAX_FD in #(
-    if [ $? -eq 0 ] ; then
+      max*)
-        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
-            MAX_FD="$MAX_FD_LIMIT"
+        # shellcheck disable=SC2039,SC3045
-        fi
+        MAX_FD=$( ulimit -H -n ) ||
-        ulimit -n $MAX_FD
+            warn "Could not query maximum file descriptor limit"
-        if [ $? -ne 0 ] ; then
+    esac
-            warn "Could not set maximum file descriptor limit: $MAX_FD"
+    case $MAX_FD in  #(
-        fi
+      '' | soft) :;; #(
-    else
+      *)
-        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
-    fi
+        # shellcheck disable=SC2039,SC3045
-fi
+        ulimit -n "$MAX_FD" ||
-
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
 # For Darwin, add options to specify how the application appears in the dock
 if $darwin; then
    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
 fi
 # For Cygwin, switch paths to Windows format before running java
 if $cygwin ; then
    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
    JAVACMD=`cygpath --unix "$JAVACMD"`
    # We build the pattern for arguments to be converted via cygpath
    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
    SEP=""
    for dir in $ROOTDIRSRAW ; do
        ROOTDIRS="$ROOTDIRS$SEP$dir"
        SEP="|"
    done
    OURCYGPATTERN="(^($ROOTDIRS))"
    # Add a user-defined pattern to the cygpath arguments
    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
    fi
    # Now convert the arguments - kludge to limit ourselves to /bin/sh
    i=0
    for arg in "$@" ; do
        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
        else
            eval `echo args$i`="\"$arg\""
        fi
        i=$((i+1))
    done
    case $i in
        (0) set -- ;;
        (1) set -- "$args0" ;;
        (2) set -- "$args0" "$args1" ;;
        (3) set -- "$args0" "$args1" "$args2" ;;
        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
    esac
 fi
-# Escape application args
+# Collect all arguments for the java command, stacking in reverse order:
-save () {
+#   * args from the command line
-    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+#   * the main class name
-    echo " "
+#   * -classpath
-}
+#   * -D...appname settings
-APP_ARGS=$(save "$@")
+#   * --module-path (only if needed)
 #   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
-# Collect all arguments for the java command, following the shell quoting and substitution rules
+# For Cygwin or MSYS, switch paths to Windows format before running java
-eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+if "$cygwin" || "$msys" ; then
    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
-# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
-if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+
-  cd "$(dirname "$0")"
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
    for arg do
        if
            case $arg in                                #(
              -*)   false ;;                            # don't mess with options #(
              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
                    [ -e "$t" ] ;;                      #(
              *)    false ;;
            esac
        then
            arg=$( cygpath --path --ignore --mixed "$arg" )
        fi
        # Roll the args list around exactly as many times as the number of
        # args, so each arg winds up back in the position where it started, but
        # possibly modified.
        #
        # NB: a `for` loop captures its iteration list before it begins, so
        # changing the positional parameters here affects neither the number of
        # iterations, nor the values presented in `arg`.
        shift                   # remove old arg
        set -- "$@" "$arg"      # push replacement arg
    done
 fi
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
 DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 # Collect all arguments for the java command:
 #   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
 #     and any embedded shellness will be escaped.
 #   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
 #     treated as '${Hostname}' itself on the command line.
 set -- \
        "-Dorg.gradle.appname=$APP_BASE_NAME" \
        -classpath "$CLASSPATH" \
        org.gradle.wrapper.GradleWrapperMain \
        "$@"
 # Stop when "xargs" is not available.
 if ! command -v xargs >/dev/null 2>&1
 then
    die "xargs is not available"
 fi
 # Use "xargs" to parse quoted args.
 #
 # With -n1 it outputs one arg per line, with the quotes and backslashes removed.
 #
 # In Bash we could simply go:
 #
 #   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
 #   set -- "${ARGS[@]}" "$@"
 #
 # but POSIX shell has neither arrays nor command substitution, so instead we
 # post-process each arg (as a line of input to sed) to backslash-escape any
 # character that might be a shell metacharacter, then use eval to reverse
 # that process (while maintaining the separation between arguments), and wrap
 # the whole thing up as a single "set" statement.
 #
 # This will of course break if any of these variables contains a newline or
 # an unmatched quote.
 #
 eval "set -- $(
        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
        xargs -n1 |
        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
        tr '\n' ' '
    )" '"$@"'
 exec "$JAVACMD" "$@"
--- a/gradlew.bat
+++ b/gradlew.bat
@@ -1,4 +1,20 @@
-@if "%DEBUG%" == "" @echo off
+@rem
@rem Copyright 2015 the original author or authors.
@rem
@rem Licensed under the Apache License, Version 2.0 (the "License");
@rem you may not use this file except in compliance with the License.
@rem You may obtain a copy of the License at
@rem
@rem      https://www.apache.org/licenses/LICENSE-2.0
@rem
@rem Unless required by applicable law or agreed to in writing, software
@rem distributed under the License is distributed on an "AS IS" BASIS,
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@rem See the License for the specific language governing permissions and
@rem limitations under the License.
@rem
@if "%DEBUG%"=="" @echo off
@rem ##########################################################################
@rem
@rem  Gradle startup script for Windows
@@ -9,19 +25,23 @@
 if "%OS%"=="Windows_NT" setlocal
 set DIRNAME=%~dp0
-if "%DIRNAME%" == "" set DIRNAME=.
+if "%DIRNAME%"=="" set DIRNAME=.
@rem This is normally unused
 set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
@rem Resolve any "." and ".." in APP_HOME to make it shorter.
 for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS=
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
@rem Find java.exe
 if defined JAVA_HOME goto findJavaFromJavaHome
 set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
-if "%ERRORLEVEL%" == "0" goto init
+if %ERRORLEVEL% equ 0 goto execute
 echo.
 echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
@@ -35,7 +55,7 @@ goto fail
 set JAVA_HOME=%JAVA_HOME:"=%
 set JAVA_EXE=%JAVA_HOME%/bin/java.exe
-if exist "%JAVA_EXE%" goto init
+if exist "%JAVA_EXE%" goto execute
 echo.
 echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
@@ -45,38 +65,26 @@ echo location of your Java installation.
 goto fail
 :init
@rem Get command-line arguments, handling Windows variants
 if not "%OS%" == "Windows_NT" goto win9xME_args
 :win9xME_args
@rem Slurp the command line arguments.
 set CMD_LINE_ARGS=
 set _SKIP=2
 :win9xME_args_slurp
 if "x%~1" == "x" goto execute
 set CMD_LINE_ARGS=%*
 :execute
@rem Setup the command line
 set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
@rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
 :end
@rem End local scope for the variables with windows NT shell
-if "%ERRORLEVEL%"=="0" goto mainEnd
+if %ERRORLEVEL% equ 0 goto mainEnd
 :fail
 rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
 rem the _cmd.exe /c_ return code!
-if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+set EXIT_CODE=%ERRORLEVEL%
-exit /b 1
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
 if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
 exit /b %EXIT_CODE%
 :mainEnd
 if "%OS%"=="Windows_NT" endlocal
--- a/images/console_output.png
+++ b/images/console_output.png
--- a/kotlin-js-store/yarn.lock
+++ b/kotlin-js-store/yarn.lock
--- a/scripts/publish-mavencentral.gradle
+++ b/scripts/publish-mavencentral.gradle
@@ -1,122 +0,0 @@
 task androidSourcesJar(type: Jar) {
    archiveClassifier.set("sources")
    from android.sourceSets.main.java.source
 }
 artifacts {
    archives androidSourcesJar
 }
 apply plugin: 'maven-publish'
 apply plugin: 'signing'
 group = PUBLISH_GROUP_ID
 version = PUBLISH_VERSION
 ext["signing.keyId"] = ''
 ext["signing.password"] = ''
 ext["signing.secretKeyRingFile"] = ''
 ext["ossrhUsername"] = ''
 ext["ossrhPassword"] = ''
 File secretPropsFile = project.rootProject.file('local.properties')
 if (secretPropsFile.exists()) {
    println "Found secret props file, loading props"
    Properties p = new Properties()
    p.load(new FileInputStream(secretPropsFile))
    p.each { name, value ->
        ext[name] = value
    }
 } else {
    println "No props file, loading env vars"
    ext["signing.keyId"] = System.getenv('SIGNING_KEY_ID')
    ext["signing.password"] = System.getenv('SIGNING_PASSWORD')
    ext["signing.secretKeyRingFile"] = System.getenv('SIGNING_SECRET_KEY_RING_FILE')
    ext["ossrhUsername"] = System.getenv('OSSRH_USERNAME')
    ext["ossrhPassword"] = System.getenv('OSSRH_PASSWORD')
 }
 nexusStaging {
    packageGroup = PUBLISH_GROUP_ID
    stagingProfileId = '2097bad464f778'
    username = ossrhUsername
    password = ossrhPassword
 }
 publishing {
    publications {
        release(MavenPublication) {
            // The coordinates of the library, being set from variables that
            // we'll set up in a moment
            groupId PUBLISH_GROUP_ID
            artifactId PUBLISH_ARTIFACT_ID
            version PUBLISH_VERSION
            // Two artifacts, the `aar` and the sources
            artifact("$buildDir/outputs/aar/${project.getName()}-release.aar")
            artifact androidSourcesJar
            // Self-explanatory metadata for the most part
            pom {
                name = PUBLISH_ARTIFACT_ID
                description = 'Simple implementation to store object in tree structure.'
                // If your project has a dedicated site, use its URL here
                url = 'https://github.com/AdrianKuta/Tree-Data-Structure'
                licenses {
                    license {
                        name = 'MIT License'
                        url = 'https://www.mit.edu/~amini/LICENSE.md'
                    }
                }
                developers {
                    developer {
                        name = 'Adrian Kuta'
                        email = 'adrian.kuta93@gmail.com'
                    }
                }
                // Version control info, if you're using GitHub, follow the format as seen here
                scm {
                    connection = 'scm:git:github.com/AdrianKuta/Tree-Data-Structure.git'
                    developerConnection = 'scm:git:ssh://github.com/AdrianKuta/Tree-Data-Structure.git'
                    url = 'https://github.com/AdrianKuta/Tree-Data-Structure/tree/master'
                }
                // A slightly hacky fix so that your POM will include any transitive dependencies
                // that your library builds upon
                withXml {
                    def dependenciesNode = asNode().appendNode('dependencies')
                    project.configurations.implementation.allDependencies.each {
                        def dependencyNode = dependenciesNode.appendNode('dependency')
                        dependencyNode.appendNode('groupId', it.group)
                        dependencyNode.appendNode('artifactId', it.name)
                        dependencyNode.appendNode('version', it.version)
                    }
                }
            }
        }
    }
    repositories {
        // The repository to publish to, Sonatype/MavenCentral
        maven {
            // This is an arbitrary name, you may also use "mavencentral" or
            // any other name that's descriptive for you
            name = "sonatype"
            def releasesRepoUrl = "https://oss.sonatype.org/service/local/staging/deploy/maven2/"
            def snapshotsRepoUrl = "https://oss.sonatype.org/content/repositories/snapshots/"
            // You only need this if you want to publish snapshots, otherwise just set the URL
            // to the release repo directly
            url = version.endsWith('SNAPSHOT') ? snapshotsRepoUrl : releasesRepoUrl
            // The username and password we've fetched earlier
            credentials {
                username ossrhUsername
                password ossrhPassword
            }
        }
    }
 }
 signing {
    sign publishing.publications
 }
--- a/settings.gradle
+++ b/settings.gradle
@@ -1,2 +0,0 @@
 include ':app', ':treedatastructure'
 rootProject.name='Tree Data Structure'
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -0,0 +1,3 @@
 rootProject.name = "tree-structure"
--- a/treedatastructure/src/main/java/com/github/adriankuta/datastructure/tree/ChildDeclarationInterface.kt
+++ b/treedatastructure/src/main/java/com/github/adriankuta/datastructure/tree/ChildDeclarationInterface.kt
@@ -1,5 +1,7 @@
 package com.github.adriankuta.datastructure.tree
 import kotlin.jvm.JvmSynthetic
 interface ChildDeclarationInterface<T> {
    /**
@@ -15,7 +17,8 @@ interface ChildDeclarationInterface<T> {
     *     }
     * }
     * ```
     * @return New created TreeNode.
     */
    @JvmSynthetic
-    fun child(value: T, childDeclaration: ChildDeclaration<T>? = null)
+    fun child(value: T, childDeclaration: ChildDeclaration<T>? = null): TreeNode<T>
 }
--- a/treedatastructure/src/main/java/com/github/adriankuta/datastructure/tree/TreeNode.kt
+++ b/treedatastructure/src/main/java/com/github/adriankuta/datastructure/tree/TreeNode.kt
@@ -1,8 +1,20 @@
 package com.github.adriankuta.datastructure.tree
-open class TreeNode<T>(val value: T) : Iterable<TreeNode<T>>, ChildDeclarationInterface<T> {
+import com.github.adriankuta.datastructure.tree.exceptions.TreeNodeException
 import com.github.adriankuta.datastructure.tree.iterators.LevelOrderTreeIterator
 import com.github.adriankuta.datastructure.tree.iterators.PostOrderTreeIterator
 import com.github.adriankuta.datastructure.tree.iterators.PreOrderTreeIterator
 import com.github.adriankuta.datastructure.tree.iterators.TreeNodeIterators
 import com.github.adriankuta.datastructure.tree.iterators.TreeNodeIterators.*
 import kotlin.jvm.JvmSynthetic
 /**
 * @param treeIterator Choose one of available iterators from [TreeNodeIterators]
 */
 open class TreeNode<T>(val value: T, var treeIterator: TreeNodeIterators = PreOrder) : Iterable<TreeNode<T>>, ChildDeclarationInterface<T> {
    private var _parent: TreeNode<T>? = null
    /**
     * The converse notion of a child, an immediate ancestor.
     */
@@ -10,12 +22,20 @@ open class TreeNode<T>(val value: T) : Iterable<TreeNode<T>>, ChildDeclarationIn
        get() = _parent
    private val _children = mutableListOf<TreeNode<T>>()
    /**
     * A group of nodes with the same parent.
     */
    val children: List<TreeNode<T>>
        get() = _children
    /**
     * Checks whether the current tree node is the root of the tree
     * @return `true` if the current tree node is root of the tree, `false` otherwise.
     */
    val isRoot: Boolean
        get() = _parent == null
    /**
     * Add new child to current node or root.
     *
@@ -27,11 +47,13 @@ open class TreeNode<T>(val value: T) : Iterable<TreeNode<T>>, ChildDeclarationIn
    }
    @JvmSynthetic
-    override fun child(child: T, childDeclaration: ChildDeclaration<T>?) {
+    override fun child(value: T, childDeclaration: ChildDeclaration<T>?): TreeNode<T> {
        val newChild = TreeNode(value)
-        if(childDeclaration != null)
+        newChild._parent = this
        if (childDeclaration != null)
            newChild.childDeclaration()
        _children.add(newChild)
        return newChild
    }
    /**
@@ -40,6 +62,7 @@ open class TreeNode<T>(val value: T) : Iterable<TreeNode<T>>, ChildDeclarationIn
     * @return `true` if the node has been successfully removed; `false` if it was not present in the tree.
     */
    fun removeChild(child: TreeNode<T>): Boolean {
        println(child.value)
        val removed = child._parent?._children?.remove(child)
        child._parent = null
        return removed ?: false
@@ -53,7 +76,7 @@ open class TreeNode<T>(val value: T) : Iterable<TreeNode<T>>, ChildDeclarationIn
        if (_children.isEmpty())
            return 0
        return _children.size +
-                _children.sumBy { it.nodeCount() }
+                _children.sumOf { it.nodeCount() }
    }
    /**
@@ -61,7 +84,7 @@ open class TreeNode<T>(val value: T) : Iterable<TreeNode<T>>, ChildDeclarationIn
     */
    fun height(): Int {
        val childrenMaxDepth = _children.map { it.height() }
-            .max()
+            .maxOrNull()
            ?: -1 // -1 because this method counts nodes, and edges are always one less then nodes.
        return childrenMaxDepth + 1
    }
@@ -71,14 +94,39 @@ open class TreeNode<T>(val value: T) : Iterable<TreeNode<T>>, ChildDeclarationIn
     * @return The distance between current node and the root.
     */
    fun depth(): Int {
-        var _depth = 0
+        var depth = 0
        var tempParent = parent
        while (tempParent != null) {
-            _depth++
+            depth++
            tempParent = tempParent.parent
        }
-        return _depth
+        return depth
    }
    /**
     * Returns the collection of nodes, which connect the current node
     * with its descendants
     *
     * @param descendant the bottom child node for which the path is calculated
     * @return collection of nodes, which connect the current node with its descendants
     * @throws TreeNodeException exception that may be thrown in case if the
     *                           current node does not have such descendant or if the
     *                           specified tree node is root
     */
    @Throws(TreeNodeException::class)
    fun path(descendant: TreeNode<T>): List<TreeNode<T>> {
        val path = mutableListOf<TreeNode<T>>()
        var node = descendant
        path.add(node)
        while (!node.isRoot) {
            node = node.parent!!
            path.add(node)
            if (node == this)
                return path
        }
        throw TreeNodeException("The specified tree node $descendant is not the descendant of tree node $this")
    }
    /**
@@ -91,6 +139,10 @@ open class TreeNode<T>(val value: T) : Iterable<TreeNode<T>>, ChildDeclarationIn
    }
    override fun toString(): String {
        return value.toString()
    }
    fun prettyString(): String {
        val stringBuilder = StringBuilder()
        print(stringBuilder, "", "")
        return stringBuilder.toString()
@@ -112,24 +164,11 @@ open class TreeNode<T>(val value: T) : Iterable<TreeNode<T>>, ChildDeclarationIn
    }
    /**
-     * Tree is iterated by using `Pre-order Traversal Algorithm"
+     * You can change default iterator by changing [treeIterator] property.
     *  1. Check if the current node is empty or null.
     *  2. Display the data part of the root (or current node).
     *  3. Traverse the left subtree by recursively calling the pre-order function.
     *  4. Traverse the right subtree by recursively calling the pre-order function.
     * ```
     * E.g.
     *                    1
     *                  / | \
     *                 /  |   \
     *               2    3     4
     *              / \       / | \
     *             5    6    7  8  9
     *            /   / | \
     *           10  11 12 13
     *
     * Output: 1 2 5 10 6 11 12 13 3 4 7 8 9
     * ```
     */
-    override fun iterator(): Iterator<TreeNode<T>> = TreeNodeIterator(this)
+    override fun iterator(): Iterator<TreeNode<T>> = when (treeIterator) {
        PreOrder -> PreOrderTreeIterator(this)
        PostOrder -> PostOrderTreeIterator(this)
        LevelOrder -> LevelOrderTreeIterator(this)
    }
 }
--- a/treedatastructure/src/main/java/com/github/adriankuta/datastructure/tree/TreeNodeExt.kt
+++ b/treedatastructure/src/main/java/com/github/adriankuta/datastructure/tree/TreeNodeExt.kt
@@ -1,5 +1,8 @@
 package com.github.adriankuta.datastructure.tree
 import com.github.adriankuta.datastructure.tree.iterators.TreeNodeIterators
 import kotlin.jvm.JvmSynthetic
 typealias ChildDeclaration<T> = ChildDeclarationInterface<T>.() -> Unit
 /**
@@ -11,8 +14,12 @@ typealias ChildDeclaration<T> = ChildDeclarationInterface<T>.() -> Unit
 * @see [ChildDeclarationInterface.child]
 */
@JvmSynthetic
-inline fun<reified T> tree(root: T, childDeclaration: ChildDeclaration<T>): TreeNode<T> {
+inline fun <reified T> tree(
-    val treeNode = TreeNode(root)
+    root: T,
    defaultIterator: TreeNodeIterators = TreeNodeIterators.PreOrder,
    childDeclaration: ChildDeclaration<T>
 ): TreeNode<T> {
    val treeNode = TreeNode(root, defaultIterator)
    treeNode.childDeclaration()
    return treeNode
 }
--- a/src/commonMain/kotlin/com.github.adriankuta/datastructure/tree/exceptions/TreeNodeException.kt
+++ b/src/commonMain/kotlin/com.github.adriankuta/datastructure/tree/exceptions/TreeNodeException.kt
@@ -0,0 +1,6 @@
 package com.github.adriankuta.datastructure.tree.exceptions
 import kotlin.jvm.JvmOverloads
 class TreeNodeException @JvmOverloads constructor(message: String? = null, cause: Throwable? = null) :
    RuntimeException(message, cause)
--- a/src/commonMain/kotlin/com.github.adriankuta/datastructure/tree/iterators/LevelOrderTreeIterator.kt
+++ b/src/commonMain/kotlin/com.github.adriankuta/datastructure/tree/iterators/LevelOrderTreeIterator.kt
@@ -0,0 +1,39 @@
 package com.github.adriankuta.datastructure.tree.iterators
 import com.github.adriankuta.datastructure.tree.TreeNode
 /**
 * Tree is iterated by using `Level-order Traversal Algorithm"
 * In level-order traversal we iterating nodes level by level,
 * starting from root, and going deeper and deeper in tree.
 * ```
 * E.g.
 *                    1
 *                  / | \
 *                 /  |   \
 *               2    3     4
 *              / \       / | \
 *             5    6    7  8  9
 *            /   / | \
 *           10  11 12 13
 *
 * Output: 1 2 3 4 5 6 7 8 9 10 11 12 13
 * ```
 */
 class LevelOrderTreeIterator<T>(root: TreeNode<T>) : Iterator<TreeNode<T>> {
    private val stack = ArrayDeque<TreeNode<T>>()
    init {
        stack.addLast(root)
    }
    override fun hasNext(): Boolean = stack.isNotEmpty()
    override fun next(): TreeNode<T> {
        val node =  stack.removeFirst()
        node.children
            .forEach { stack.addLast(it) }
        return node
    }
 }
--- a/src/commonMain/kotlin/com.github.adriankuta/datastructure/tree/iterators/PostOrderTreeIterator.kt
+++ b/src/commonMain/kotlin/com.github.adriankuta/datastructure/tree/iterators/PostOrderTreeIterator.kt
@@ -0,0 +1,48 @@
 package com.github.adriankuta.datastructure.tree.iterators
 import com.github.adriankuta.datastructure.tree.TreeNode
 /**
 * Tree is iterated by using `Post-order Traversal Algorithm"
 * In post-order traversal, we starting from most left child.
 * First visit all children of parent, then parent.
 * ```
 * E.g.
 *                    1
 *                  / | \
 *                 /  |   \
 *               2    3     4
 *              / \       / | \
 *             5    6    7  8  9
 *            /   / | \
 *           10  11 12 13
 *
 * Output: 10 5 11 12 13 6 2 3 7 8 9 4 1
 * ```
 */
 class PostOrderTreeIterator<T>(root: TreeNode<T>) : Iterator<TreeNode<T>> {
    private val stack = ArrayDeque<TreeNode<T>>()
    init {
        stack.addAll(getChildrenStack(root))
    }
    override fun hasNext(): Boolean = stack.isNotEmpty()
    override fun next(): TreeNode<T> {
        return stack.removeFirst()
    }
    private fun getChildrenStack(node: TreeNode<T>): ArrayDeque<TreeNode<T>> {
        val stack = ArrayDeque<TreeNode<T>>()
        if(node.children.isEmpty()) {
            return ArrayDeque(listOf(node))
        }
        node.children.forEach {
            stack.addAll(getChildrenStack(it))
        }
        stack.addLast(node)
        return stack
    }
 }
--- a/src/commonMain/kotlin/com.github.adriankuta/datastructure/tree/iterators/PreOrderTreeIterator.kt
+++ b/src/commonMain/kotlin/com.github.adriankuta/datastructure/tree/iterators/PreOrderTreeIterator.kt
@@ -0,0 +1,40 @@
 package com.github.adriankuta.datastructure.tree.iterators
 import com.github.adriankuta.datastructure.tree.TreeNode
 /**
 * Tree is iterated by using `Pre-order Traversal Algorithm"
 * The pre-order traversal is a topologically sorted one,
 * because a parent node is processed before any of its child nodes is done.
 * ```
 * E.g.
 *                    1
 *                  / | \
 *                 /  |   \
 *               2    3     4
 *              / \       / | \
 *             5    6    7  8  9
 *            /   / | \
 *           10  11 12 13
 *
 * Output: 1 2 5 10 6 11 12 13 3 4 7 8 9
 * ```
 */
 class PreOrderTreeIterator<T>(root: TreeNode<T>) : Iterator<TreeNode<T>> {
    private val stack = ArrayDeque<TreeNode<T>>()
    init {
        stack.addLast(root)
    }
    override fun hasNext(): Boolean = stack.isNotEmpty()
    override fun next(): TreeNode<T> {
        val node = stack.removeLast()
        node.children
            .asReversed()
            .forEach { stack.addLast(it) }
        return node
    }
 }
--- a/src/commonMain/kotlin/com.github.adriankuta/datastructure/tree/iterators/TreeNodeIterators.kt
+++ b/src/commonMain/kotlin/com.github.adriankuta/datastructure/tree/iterators/TreeNodeIterators.kt
@@ -0,0 +1,68 @@
 package com.github.adriankuta.datastructure.tree.iterators
 /**
 * @see PreOrder
 * @see PostOrder
 * @see LevelOrder
 */
 enum class TreeNodeIterators {
    /**
     * Tree is iterated by using `Pre-order Traversal Algorithm"
     * The pre-order traversal is a topologically sorted one,
     * because a parent node is processed before any of its child nodes is done.
     * ```
     * E.g.
     *                    1
     *                  / | \
     *                 /  |   \
     *               2    3     4
     *              / \       / | \
     *             5    6    7  8  9
     *            /   / | \
     *           10  11 12 13
     *
     * Output: 1 2 5 10 6 11 12 13 3 4 7 8 9
     * ```
     */
    PreOrder,
    /**
     * Tree is iterated by using `Post-order Traversal Algorithm"
     * In post-order traversal, we starting from most left child.
     * First visit all children of parent, then parent.
     * ```
     * E.g.
     *                    1
     *                  / | \
     *                 /  |   \
     *               2    3     4
     *              / \       / | \
     *             5    6    7  8  9
     *            /   / | \
     *           10  11 12 13
     *
     * Output: 10 5 11 12 13 6 2 3 7 8 9 4 1
     * ```
     */
    PostOrder,
    /**
     * Tree is iterated by using `Level-order Traversal Algorithm"
     * In level-order traversal we iterating nodes level by level,
     * starting from root, and going deeper and deeper in tree.
     * ```
     * E.g.
     *                    1
     *                  / | \
     *                 /  |   \
     *               2    3     4
     *              / \       / | \
     *             5    6    7  8  9
     *            /   / | \
     *           10  11 12 13
     *
     * Output: 1 2 3 4 5 6 7 8 9 10 11 12 13
     * ```
     */
    LevelOrder
 }
--- a/treedatastructure/src/test/java/com/github/adriankuta/datastructure/tree/ExampleUnitTest.kt
+++ b/treedatastructure/src/test/java/com/github/adriankuta/datastructure/tree/ExampleUnitTest.kt
@@ -1,8 +1,7 @@
 package com.github.adriankuta.datastructure.tree
-import org.junit.Test
+import kotlin.test.Test
-
+import kotlin.test.assertEquals
 import org.junit.Assert.*
 /**
 * Example local unit test, which will execute on the development machine (host).
--- a/src/commonTest/kotlin/com.github.adriankuta/datastructure.tree/TreeNodeTest.kt
+++ b/src/commonTest/kotlin/com.github.adriankuta/datastructure.tree/TreeNodeTest.kt
@@ -0,0 +1,228 @@
 package com.github.adriankuta.datastructure.tree
 import com.github.adriankuta.datastructure.tree.iterators.TreeNodeIterators
 import kotlin.test.Test
 import kotlin.test.assertContentEquals
 import kotlin.test.assertEquals
 import kotlin.test.assertNull
 class TreeNodeTest {
    @Test
    fun removeNodeTest() {
        val root = TreeNode("Root")
        val beveragesNode = TreeNode("Beverages")
        val curdNode = TreeNode("Curd")
        root.addChild(beveragesNode)
        root.addChild(curdNode)
        val teaNode = TreeNode("tea")
        val coffeeNode = TreeNode("coffee")
        val milkShakeNode = TreeNode("Milk Shake")
        beveragesNode.addChild(teaNode)
        beveragesNode.addChild(coffeeNode)
        beveragesNode.addChild(milkShakeNode)
        val gingerTeaNode = TreeNode("ginger tea")
        val normalTeaNode = TreeNode("normal tea")
        teaNode.addChild(gingerTeaNode)
        teaNode.addChild(normalTeaNode)
        val yogurtNode = TreeNode("yogurt")
        val lassiNode = TreeNode("lassi")
        curdNode.addChild(yogurtNode)
        curdNode.addChild(lassiNode)
        assertEquals(
            "Root\n" +
                    "├── Beverages\n" +
                    "│   ├── tea\n" +
                    "│   │   ├── ginger tea\n" +
                    "│   │   └── normal tea\n" +
                    "│   ├── coffee\n" +
                    "│   └── Milk Shake\n" +
                    "└── Curd\n" +
                    "    ├── yogurt\n" +
                    "    └── lassi\n",
            root.prettyString(),
            "Pretty print test"
        )
        root.removeChild(curdNode)
        root.removeChild(gingerTeaNode)
        assertEquals(
            "Root\n" +
                    "└── Beverages\n" +
                    "    ├── tea\n" +
                    "    │   └── normal tea\n" +
                    "    ├── coffee\n" +
                    "    └── Milk Shake\n",
            root.prettyString(),
            "Remove node test"
        )
    }
    @Test
    fun clearTest() {
        val root = TreeNode("Root")
        val beveragesNode = TreeNode("Beverages")
        val curdNode = TreeNode("Curd")
        root.addChild(beveragesNode)
        root.addChild(curdNode)
        val teaNode = TreeNode("tea")
        val coffeeNode = TreeNode("coffee")
        val milkShakeNode = TreeNode("Milk Shake")
        beveragesNode.addChild(teaNode)
        beveragesNode.addChild(coffeeNode)
        beveragesNode.addChild(milkShakeNode)
        val gingerTeaNode = TreeNode("ginger tea")
        val normalTeaNode = TreeNode("normal tea")
        teaNode.addChild(gingerTeaNode)
        teaNode.addChild(normalTeaNode)
        val yogurtNode = TreeNode("yogurt")
        val lassiNode = TreeNode("lassi")
        curdNode.addChild(yogurtNode)
        curdNode.addChild(lassiNode)
        root.clear()
        assertEquals(root.children, emptyList())
        assertEquals(beveragesNode.children, emptyList())
        assertEquals(curdNode.children, emptyList())
        assertEquals(teaNode.children, emptyList())
        assertEquals(coffeeNode.children, emptyList())
        assertEquals(milkShakeNode.children, emptyList())
        assertEquals(gingerTeaNode.children, emptyList())
        assertEquals(normalTeaNode.children, emptyList())
        assertEquals(yogurtNode.children, emptyList())
        assertEquals(lassiNode.children, emptyList())
        assertNull(root.parent)
        assertNull(beveragesNode.parent)
        assertNull(curdNode.parent)
        assertNull(teaNode.parent)
        assertNull(coffeeNode.parent)
        assertNull(milkShakeNode.parent)
        assertNull(gingerTeaNode.parent)
        assertNull(normalTeaNode.parent)
        assertNull(yogurtNode.parent)
        assertNull(lassiNode.parent)
    }
    @Test
    fun kotlinExtTest() {
        val root = TreeNode("World")
        val northA = TreeNode("North America")
        val europe = TreeNode("Europe")
        root.addChild(northA)
        root.addChild(europe)
        val usa = TreeNode("USA")
        northA.addChild(usa)
        val poland = TreeNode("Poland")
        val france = TreeNode("France")
        europe.addChild(poland)
        europe.addChild(france)
        val rootExt = tree("World") {
            child("North America") {
                child("USA")
            }
            child("Europe") {
                child("Poland")
                child("France")
            }
        }
        assertEquals(root.prettyString(), rootExt.prettyString())
    }
    @Test
    fun preOrderIteratorTest() {
        val tree = tree("F") {
            child("B") {
                child("A")
                child("D") {
                    child("C")
                    child("E")
                }
            }
            child("G") {
                child("I") {
                    child("H")
                }
            }
        }
        val expectedPreOrder = listOf("F", "B", "A", "D", "C", "E", "G", "I", "H")
        assertContentEquals(expectedPreOrder, tree.toList().map { it.toString() })
    }
    @Test
    fun postOrderIteratorTest() {
        val tree = tree("A", TreeNodeIterators.PostOrder) {
            child("B") {
                child("E")
            }
            child("C")
            child("D") {
                child("F")
                child("G")
                child("H")
                child("I")
                child("J")
            }
        }
        val expectedPreOrder = listOf("E", "B", "C", "F", "G", "H", "I", "J", "D", "A")
        assertContentEquals(expectedPreOrder, tree.toList().map { it.toString() })
    }
    @Test
    fun secondPostOrderIteratorTest() {
        val tree = tree(1, TreeNodeIterators.PostOrder) {
            child(2) {
                child(5) {
                    child(10)
                }
                child(6) {
                    child(11)
                    child(12)
                    child(13)
                }
            }
            child(3)
            child(4) {
                child(7)
                child(8)
                child(9)
            }
        }
        val expectedOrder = listOf(10, 5, 11, 12, 13, 6, 2, 3, 7, 8, 9, 4, 1)
        assertContentEquals(expectedOrder, tree.toList().map { it.value })
    }
    @Test
    fun levelOrderIteratorTest() {
        val tree = tree(1, TreeNodeIterators.LevelOrder) {
            child(2) {
                child(5) {
                    child(10)
                }
                child(6) {
                    child(11)
                    child(12)
                    child(13)
                }
            }
            child(3)
            child(4) {
                child(7)
                child(8)
                child(9)
            }
        }
        val expectedOrder = listOf(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
        assertContentEquals(expectedOrder, tree.toList().map { it.value })
    }
 }
--- a/src/jvmMain/kotlin/Example.ws.kts
+++ b/src/jvmMain/kotlin/Example.ws.kts
@@ -0,0 +1,14 @@
 import com.github.adriankuta.datastructure.tree.tree
 val root =
    tree("World") {
        child("North America") {
            child("USA")
        }
        child("Europe") {
            child("Poland")
            child("Germany")
        }
    }
 print(root.prettyString())
--- a/treedatastructure/.gitignore
+++ b/treedatastructure/.gitignore
@@ -1 +0,0 @@
 /build
--- a/treedatastructure/build.gradle
+++ b/treedatastructure/build.gradle
@@ -1,48 +0,0 @@
 apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
 afterEvaluate {
    generateReleaseBuildConfig.enabled = false
 }
 android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        minSdkVersion 15
        targetSdkVersion 29
        versionCode 1
        versionName "1.2.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        consumerProguardFiles 'consumer-rules.pro'
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
 }
 dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.core:core-ktx:1.1.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
 }
 ext {
    PUBLISH_GROUP_ID = 'com.github.adriankuta'
    PUBLISH_ARTIFACT_ID = 'tree-structure'
    PUBLISH_VERSION = android.defaultConfig.versionName
 }
 apply from: "${rootProject.projectDir}/scripts/publish-mavencentral.gradle"
--- a/treedatastructure/consumer-rules.pro
+++ b/treedatastructure/consumer-rules.pro
--- a/treedatastructure/proguard-rules.pro
+++ b/treedatastructure/proguard-rules.pro
@@ -1,21 +0,0 @@
 # Add project specific ProGuard rules here.
 # You can control the set of applied configuration files using the
 # proguardFiles setting in build.gradle.
 #
 # For more details, see
 #   http://developer.android.com/guide/developing/tools/proguard.html
 # If your project uses WebView with JS, uncomment the following
 # and specify the fully qualified class name to the JavaScript interface
 # class:
 #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
 #   public *;
 #}
 # Uncomment this to preserve the line number information for
 # debugging stack traces.
 #-keepattributes SourceFile,LineNumberTable
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
 #-renamesourcefileattribute SourceFile
--- a/treedatastructure/src/androidTest/java/com/github/adriankuta/datastructure/tree/ExampleInstrumentedTest.kt
+++ b/treedatastructure/src/androidTest/java/com/github/adriankuta/datastructure/tree/ExampleInstrumentedTest.kt
@@ -1,24 +0,0 @@
 package com.github.adriankuta.datastructure.tree
 import androidx.test.platform.app.InstrumentationRegistry
 import androidx.test.ext.junit.runners.AndroidJUnit4
 import org.junit.Test
 import org.junit.runner.RunWith
 import org.junit.Assert.*
 /**
 * Instrumented test, which will execute on an Android device.
 *
 * See [testing documentation](http://d.android.com/tools/testing).
 */
@RunWith(AndroidJUnit4::class)
 class ExampleInstrumentedTest {
    @Test
    fun useAppContext() {
        // Context of the app under test.
        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
        assertEquals("com.github.adriankuta.datastructure.tree.test", appContext.packageName)
    }
 }
--- a/treedatastructure/src/main/AndroidManifest.xml
+++ b/treedatastructure/src/main/AndroidManifest.xml
@@ -1,2 +0,0 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.github.adriankuta.datastructure.tree" />
--- a/treedatastructure/src/main/java/com/github/adriankuta/datastructure/tree/TreeNodeIterator.kt
+++ b/treedatastructure/src/main/java/com/github/adriankuta/datastructure/tree/TreeNodeIterator.kt
@@ -1,22 +0,0 @@
 package com.github.adriankuta.datastructure.tree
 import java.util.*
 class TreeNodeIterator<T>(root: TreeNode<T>) : Iterator<TreeNode<T>> {
    private val stack = Stack<TreeNode<T>>()
    init {
        stack.push(root)
    }
    override fun hasNext(): Boolean = !stack.empty()
    override fun next(): TreeNode<T> {
        val node = stack.pop()
        node.children
            .asReversed()
            .forEach { stack.push(it) }
        return node
    }
 }
--- a/treedatastructure/src/main/res/values/strings.xml
+++ b/treedatastructure/src/main/res/values/strings.xml
@@ -1,3 +0,0 @@
 <resources>
    <string name="app_name">Tree Data Structure</string>
 </resources>
--- a/treedatastructure/src/test/java/com/github/adriankuta/datastructure/tree/TreeNodeTest.kt
+++ b/treedatastructure/src/test/java/com/github/adriankuta/datastructure/tree/TreeNodeTest.kt
@@ -1,145 +0,0 @@
 package com.github.adriankuta.datastructure.tree
 import org.hamcrest.CoreMatchers.`is`
 import org.hamcrest.CoreMatchers.nullValue
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertThat
 import org.junit.Test
 class TreeNodeTest {
    @Test
    fun removeNodeTest() {
        val root = TreeNode<String>("Root")
        val beveragesNode = TreeNode<String>("Beverages")
        val curdNode = TreeNode<String>("Curd")
        root.addChild(beveragesNode)
        root.addChild(curdNode)
        val teaNode = TreeNode<String>("tea")
        val coffeeNode = TreeNode<String>("coffee")
        val milkShakeNode = TreeNode<String>("Milk Shake")
        beveragesNode.addChild(teaNode)
        beveragesNode.addChild(coffeeNode)
        beveragesNode.addChild(milkShakeNode)
        val gingerTeaNode = TreeNode<String>("ginger tea")
        val normalTeaNode = TreeNode<String>("normal tea")
        teaNode.addChild(gingerTeaNode)
        teaNode.addChild(normalTeaNode)
        val yogurtNode = TreeNode<String>("yogurt")
        val lassiNode = TreeNode<String>("lassi")
        curdNode.addChild(yogurtNode)
        curdNode.addChild(lassiNode)
        assertEquals(
            "Root\n" +
                    "├── Beverages\n" +
                    "│   ├── tea\n" +
                    "│   │   ├── ginger tea\n" +
                    "│   │   └── normal tea\n" +
                    "│   ├── coffee\n" +
                    "│   └── Milk Shake\n" +
                    "└── Curd\n" +
                    "    ├── yogurt\n" +
                    "    └── lassi\n", root.toString()
        )
        System.out.println("Remove: ${curdNode.value}")
        root.removeChild(curdNode)
        System.out.println("Remove: ${gingerTeaNode.value}")
        root.removeChild(gingerTeaNode)
        assertEquals(
            "Root\n" +
                    "└── Beverages\n" +
                    "    ├── tea\n" +
                    "    │   └── normal tea\n" +
                    "    ├── coffee\n" +
                    "    └── Milk Shake\n", root.toString()
        )
    }
    @Test
    fun clearTest() {
        val root = TreeNode<String>("Root")
        val beveragesNode = TreeNode<String>("Beverages")
        val curdNode = TreeNode<String>("Curd")
        root.addChild(beveragesNode)
        root.addChild(curdNode)
        val teaNode = TreeNode<String>("tea")
        val coffeeNode = TreeNode<String>("coffee")
        val milkShakeNode = TreeNode<String>("Milk Shake")
        beveragesNode.addChild(teaNode)
        beveragesNode.addChild(coffeeNode)
        beveragesNode.addChild(milkShakeNode)
        val gingerTeaNode = TreeNode<String>("ginger tea")
        val normalTeaNode = TreeNode<String>("normal tea")
        teaNode.addChild(gingerTeaNode)
        teaNode.addChild(normalTeaNode)
        val yogurtNode = TreeNode<String>("yogurt")
        val lassiNode = TreeNode<String>("lassi")
        curdNode.addChild(yogurtNode)
        curdNode.addChild(lassiNode)
        println(root.toString())
        println(curdNode.height())
        root.clear()
        assertThat(root.children, `is`(emptyList()))
        assertThat(beveragesNode.children, `is`(emptyList()))
        assertThat(curdNode.children, `is`(emptyList()))
        assertThat(teaNode.children, `is`(emptyList()))
        assertThat(coffeeNode.children, `is`(emptyList()))
        assertThat(milkShakeNode.children, `is`(emptyList()))
        assertThat(gingerTeaNode.children, `is`(emptyList()))
        assertThat(normalTeaNode.children, `is`(emptyList()))
        assertThat(yogurtNode.children, `is`(emptyList()))
        assertThat(lassiNode.children, `is`(emptyList()))
        assertThat(root.parent, `is`(nullValue()))
        assertThat(beveragesNode.parent, `is`(nullValue()))
        assertThat(curdNode.parent, `is`(nullValue()))
        assertThat(teaNode.parent, `is`(nullValue()))
        assertThat(coffeeNode.parent, `is`(nullValue()))
        assertThat(milkShakeNode.parent, `is`(nullValue()))
        assertThat(gingerTeaNode.parent, `is`(nullValue()))
        assertThat(normalTeaNode.parent, `is`(nullValue()))
        assertThat(yogurtNode.parent, `is`(nullValue()))
        assertThat(lassiNode.parent, `is`(nullValue()))
    }
    @Test
    fun kotlinExtTest() {
        val root = TreeNode("World")
        val northA = TreeNode("North America")
        val europe = TreeNode("Europe")
        root.addChild(northA)
        root.addChild(europe)
        val usa = TreeNode("USA")
        northA.addChild(usa)
        val poland = TreeNode("Poland")
        val france = TreeNode("France")
        europe.addChild(poland)
        europe.addChild(france)
        val rootExt = treeNode("World") {
            treeNode("North America") {
                treeNode("USA")
            }
            treeNode("Europe") {
                treeNode("Poland")
                treeNode("France")
            }
        }
        println(root)
        assertEquals(root.toString(), rootExt.toString())
    }
 }
Author	SHA1	Message	Date
Adrian Kuta	60c50f078d	Bump version to 3.1.2	2025-10-14 18:47:18 +02:00
Adrian Kuta	54f5074483	26-add-ios-target (#28 ) * Refactor: Modernize build and publishing workflow - Upgraded Kotlin from 1.7.20 to 1.9.20. - Upgraded JDK from 11 to 21 across all GitHub Actions workflows. - Replaced the legacy `maven-publish` plugin with `com.vanniktech.maven.publish` for simplified publishing to Maven Central. - Removed the `publishSnapshot.yml` workflow, as snapshot publishing is now managed by the new plugin. - Updated `publishRelease.yml` to use the `publishToMavenCentral` task and new secrets (`MAVEN_CENTRAL_USERNAME`, `MAVEN_CENTRAL_PASSWORD`). - Simplified `build.gradle.kts` by removing manual publishing and signing logic. - Set the JVM target to "21". - Bumped the project version to `3.1.1`. - Removed `js` targets and related configurations. - Added a new code style configuration file for the project (`.idea/codeStyles/Project.xml`). * fix: Add JavaScript targets - Added JS (IR) targets (`browser` and `nodejs`) to the Kotlin Multiplatform configuration for publishing. * Improve README and document new publishing workflow - Expanded the project description to highlight key features like Kotlin Multiplatform support, traversal iterators, DSL, and utility functions. - Added a new "Installation" section with instructions for Gradle (Kotlin/Groovy) and Maven. - Added a "Traversal and utilities" section to demonstrate usage of iterators and helper functions. - Replaced the old publishing documentation with updated instructions for publishing to Maven Central via the Central Portal. - Detailed the two publishing methods: automatically via GitHub Actions on release and manually via local Gradle commands. - Clarified required secrets and environment variables for the new publishing process.	2025-10-14 18:46:05 +02:00
Adrian Kuta	772eeb0465	Migrate publishing to Sonatype s01 and Central Portal Some checks failed Publish Snapshot / test (push) Has been cancelled Details Publish Snapshot / Publish Snapshot (push) Has been cancelled Details - Updated build script to support publishing to Sonatype's s01.oss.sonatype.org, which is compatible with the new Maven Central Portal. - Prioritized Central Portal credentials (CENTRAL_USERNAME, CENTRAL_PASSWORD) over legacy OSSRH credentials. - Updated repository URLs for releases and snapshots to point to s01.oss.sonatype.org. - Added documentation in README.md explaining the new publishing setup, environment variables, and Gradle tasks.	2025-09-09 09:12:20 +02:00
Adrian Kuta	456f889b9c	Upgrade Gradle and add iOS targets (#27 ) Some checks failed Publish Snapshot / test (push) Has been cancelled Details Publish Snapshot / Publish Snapshot (push) Has been cancelled Details - Upgraded Gradle wrapper to version 8.5. - Updated Gradle build scripts and configurations. - Added iOS targets (iosX64, iosArm64, iosSimulatorArm64) to the Kotlin Multiplatform setup. - Configured shared iOS source sets. - Bumped project version to 3.1.0. - Updated JDK version to 21 in project settings. - Removed kotlinScripting.xml. - Added runConfigurations.xml and AndroidProjectSystem.xml. (cherry picked from commit `06dc507590`)	2025-09-05 11:17:54 +02:00
Adrian Kuta	c3a4ca5925	Revert "Upgrade Gradle and add iOS targets" This reverts commit `06dc507590`.	2025-09-05 11:14:44 +02:00
Adrian Kuta	06dc507590	Upgrade Gradle and add iOS targets - Upgraded Gradle wrapper to version 8.5. - Updated Gradle build scripts and configurations. - Added iOS targets (iosX64, iosArm64, iosSimulatorArm64) to the Kotlin Multiplatform setup. - Configured shared iOS source sets. - Bumped project version to 3.1.0. - Updated JDK version to 21 in project settings. - Removed kotlinScripting.xml. - Added runConfigurations.xml and AndroidProjectSystem.xml.	2025-09-05 11:14:05 +02:00
Adrian Kuta	5eaf027dba	Create dependabot.yml Some checks failed Publish Snapshot / test (push) Has been cancelled Details Publish Snapshot / Publish Snapshot (push) Has been cancelled Details	2025-08-19 21:36:09 +02:00
Adrian Kuta	04c3728fcd	24: Add iterator param to TreeNode's constructor. (#25 )	2023-07-24 18:50:46 +02:00
Adrian Kuta	d34050e9af	Merge pull request #23 from AdrianKuta/develop Relese 3.0.1	2023-02-22 14:32:58 +01:00
Adrian Kuta	2c8381deac	Bump version to v3.0.1	2023-02-22 14:30:18 +01:00
Adrian Kuta	4aacbc9dbc	21: Added `path` function to `TreeNode` (#22 ) Path refers to the sequence of nodes along the edges of a tree.	2023-02-22 14:29:22 +01:00
Adrian Kuta	8a4e677ebf	Merge remote-tracking branch 'origin/master' into develop	2023-02-22 12:45:16 +01:00
Adrian Kuta	84e85f3240	Add javaDoc to release library (#20 )	2022-12-16 22:26:14 +01:00
Adrian Kuta	e34a85ac39	Add javaDoc to release library	2022-12-16 22:22:29 +01:00
Adrian Kuta	c306088ea3	Merge pull request #19 from AdrianKuta/develop Improvements	2022-12-16 19:26:50 +01:00
Adrian Kuta	308c37720d	Fix snapshot CI	2022-12-16 19:24:35 +01:00
Adrian Kuta	90af315222	Fix release CI	2022-12-16 19:23:23 +01:00
Adrian Kuta	bd5e4f07ae	Fix README.md	2022-12-16 19:22:52 +01:00
Adrian Kuta	ae4757fb9d	Set the correct file structure to maintain backward compatibility. (#18 )	2022-12-16 19:05:59 +01:00
Adrian Kuta	5dd586f9af	4: Implement Level-order traversal algorithm (#17 )	2022-12-16 19:00:25 +01:00
Adrian Kuta	b69e838a8a	5: Implement post-order traversal algorithm (#16 )	2022-12-16 18:57:34 +01:00
Adrian Kuta	8a2710339a	14 improve GitHub actions (#15 ) * 14: Test CI * 14: Test CI * 14: Test CI * 14: Test CI * 14: Test CI * 14: Test CI * 14: Test CI	2022-12-15 16:28:33 +01:00
Adrian Kuta	dd773e3b16	10 Convert into multiplatform library (#13 ) * 10: Convert library into Kotlin Multiplatform library * 10: Setup CI * 10: Setup CI * 10: Test CI * 10: Test CI * 10: Test CI * 10: Test CI * 10: Test CI * 10: Test CI * 10: Test CI	2022-12-15 15:34:36 +01:00
Adrian Kuta	72c94f280d	Merge pull request #12 from AdrianKuta/release/v.2.1.0 Release 2.1.0	2022-11-24 23:06:48 +01:00
Adrian Kuta	809914274a	Update dependencies (#11 )	2022-11-24 23:06:09 +01:00
Adrian Kuta	6f16f1cb85	Update README.md	2022-11-23 09:49:48 +01:00
Adrian Kuta	cad5b2dd95	Iterator class refactor	2021-09-03 13:35:18 +02:00
Adrian Kuta	74a6a65434	Merge pull request #9 from AdrianKuta/pr_test Set up GitHub Actions	2021-09-03 13:23:25 +02:00
Adrian Kuta	b0a6c701ae	Update README.md	2021-09-03 13:23:15 +02:00
Adrian Kuta	1bd47fcb21	Set up GitHub Actions	2021-09-03 13:19:09 +02:00
Adrian Kuta	20bd96918c	Set up GitHub Actions	2021-09-03 13:17:27 +02:00
Adrian Kuta	60805b7187	Set up GitHub Actions	2021-09-03 13:14:25 +02:00
Adrian Kuta	12b1df764c	Set up GitHub Actions	2021-09-03 13:12:09 +02:00
Adrian Kuta	43b8982b88	Update README.md	2021-09-03 13:02:32 +02:00
Adrian Kuta	7be868648b	Set up GitHub Actions	2021-09-03 12:45:31 +02:00
Adrian Kuta	1702d8dfb5	Set up GitHub Actions	2021-09-03 12:39:38 +02:00
Adrian Kuta	8ac2901e23	Set up GitHub Actions	2021-09-03 12:37:28 +02:00
Adrian Kuta	e47c8593da	Set up GitHub Actions	2021-09-03 12:31:31 +02:00
Adrian Kuta	060f557752	fixed github actions	2021-09-03 12:16:19 +02:00
Adrian Kuta	224e4d8a29	Merge pull request #8 from AdrianKuta/feat/GitHub_Actions feat: set up GitHub Actions	2021-09-03 11:52:41 +02:00
Adrian Kuta	4c8c8ecb05	feat: set up GitHub Actions	2021-09-03 11:42:37 +02:00
Adrian Kuta	1199ae2d14	Merge pull request #7 from AdrianKuta/feat/6-upgrade_build_gradle_to_7.0.2 feat: Upgrade build gradle to 7.0.2	2021-09-03 11:42:00 +02:00
Adrian Kuta	784ab07442	feat: Upgrade build gradle to 7.0.2	2021-09-03 11:17:36 +02:00
Adrian Kuta	0e53380420	Update README.md	2020-01-28 18:24:30 +01:00
Adrian Kuta	c2ebd5dfe4	`child` function is now returning TreeNode	2020-01-21 15:39:44 +01:00
Adrian Kuta	c320411a40	`child` function is now returning TreeNode	2020-01-21 15:38:44 +01:00
Adrian Kuta	3c3d418aa2	v1.2.2	2020-01-21 15:11:32 +01:00
Adrian Kuta	f00ab975dc	Fixed tree initialization in Kotlin	2020-01-21 15:11:04 +01:00
Adrian Kuta	eb2d5f07be	Extracted prettyString from `toString()` method to new method `prettyString()`	2020-01-20 15:42:15 +01:00
		`@@ -1,2 +0,0 @@`
			`include ':app', ':treedatastructure'`
			`rootProject.name='Tree Data Structure'`
		`@@ -1,2 +0,0 @@`
			`<manifest xmlns:android="http://schemas.android.com/apk/res/android"`
			`package="com.github.adriankuta.datastructure.tree" />`