kr.tree

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    <toc-element toc-title="Get started" topic="getting-started.md"/>
    <toc-element toc-title="Take Kotlin tour" topic="kotlin-tour-welcome.md">
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    <toc-element toc-title="What's new in Kotlin">
        <toc-element toc-title="Kotlin 2.4.0-Beta1" topic="whatsnew-eap.md"/>
        <toc-element toc-title="Kotlin 2.3.20" accepts-web-file-names="whatsnew.html" topic="whatsnew2320.md"/>
        <toc-element toc-title="Kotlin 2.3.0" topic="whatsnew23.md"/>
        <toc-element toc-title="Compatibility guide" topic="compatibility-guide-23.md"/>
    </toc-element>
    <toc-element toc-title="Language guide">
        <toc-element toc-title="Basic syntax">
            <toc-element toc-title="Overview" topic="basic-syntax.md"/>
            <toc-element topic="keyword-reference.md"/>
            <toc-element topic="packages.md"/>
            <toc-element topic="annotations.md"/>
            <toc-element topic="visibility-modifiers.md"/>
        </toc-element>
        <toc-element topic="coding-conventions.md"/>
        <toc-element topic="idioms.md"/>
        <toc-element toc-title="Types">
            <toc-element toc-title="Overview" topic="types-overview.md" accepts-web-file-names="basic-types.html"/>
            <toc-element topic="numbers.md"/>
            <toc-element topic="unsigned-integer-types.md"/>
            <toc-element topic="booleans.md"/>
            <toc-element topic="characters.md"/>
            <toc-element topic="strings.md"/>
            <toc-element topic="arrays.md"/>
            <toc-element topic="typecasts.md"/>
            <toc-element topic="type-aliases.md"/>
        </toc-element>
        <toc-element toc-title="Control flow">
            <toc-element topic="control-flow.md"/>
            <toc-element topic="returns.md"/>
        </toc-element>
        <toc-element toc-title="Exception handling" topic="exceptions.md"/>
        <toc-element toc-title="Functions">
            <toc-element topic="functions.md"/>
            <toc-element toc-title="Lambdas" topic="lambdas.md"/>
            <toc-element topic="this-expressions.md"/>
            <toc-element toc-title="Builders">
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                <toc-element topic="using-builders-with-builder-inference.md"/>
            </toc-element>
            <toc-element topic="context-parameters.md"/>
            <toc-element topic="inline-functions.md"/>
            <toc-element topic="operator-overloading.md"/>
            <toc-element topic="unused-return-value-checker.md"/>
        </toc-element>
        <toc-element toc-title="Classes and interfaces">
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            <toc-element topic="data-classes.md"/>
            <toc-element topic="extensions.md"/>
            <toc-element topic="interfaces.md"/>
            <toc-element topic="delegation.md"/>
            <toc-element topic="inheritance.md"/>
            <toc-element topic="object-declarations.md"/>
            <toc-element toc-title="Special classes and interfaces">
                <toc-element topic="sealed-classes.md"/>
                <toc-element topic="enum-classes.md"/>
                <toc-element topic="inline-classes.md"/>
                <toc-element topic="nested-classes.md"/>
                <toc-element topic="fun-interfaces.md"/>
            </toc-element>
            <toc-element toc-title="Properties">
                <toc-element topic="properties.md"/>
                <toc-element topic="delegated-properties.md"/>
            </toc-element>
        </toc-element>
        <toc-element topic="null-safety.md"/>
        <toc-element topic="equality.md"/>
        <toc-element toc-title="Generics" topic="generics.md"/>
        <toc-element toc-title="Concurrency">
            <toc-element topic="async-programming.md"/>
            <toc-element topic="coroutines-overview.md"/>
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        <toc-element topic="reflection.md"/>
        <toc-element accepts-web-file-names="multi-declarations.html" topic="destructuring-declarations.md"/>
        <toc-element toc-title="Language reference">
            <toc-element toc-title="Grammar" href="https://kotlinlang.org/grammar/"/>
            <toc-element href="https://kotlinlang.org/spec/" toc-title="Language specification"/>
        </toc-element>
    </toc-element>
    <toc-element toc-title="Development">
        <toc-element toc-title="Server-side development">
            <toc-element toc-title="Overview" accepts-web-file-names="httpservlets.html" topic="server-overview.md"/>
            <toc-element topic="mixing-java-kotlin-intellij.md" toc-title="Add Kotlin to a Java project"/>
            <toc-element topic="jvm-test-using-junit.md" toc-title="Test Java code with Kotlin"/>
            <toc-element toc-title="Create a web app with Kotlin and Spring Boot">
                <toc-element accepts-web-file-names="jvm-spring-boot-restful.html,spring-boot-restful.html,spring-boot-restful-db.html,jvm-spring-boot-restful-db.html" topic="jvm-get-started-spring-boot.md"/>
                <toc-element toc-title="Create a Spring Boot project" topic="jvm-create-project-with-spring-boot.md"/>
                <toc-element toc-title="Upgrade your project with data classes" topic="jvm-spring-boot-add-data-class.md"/>
                <toc-element topic="jvm-spring-boot-add-db-support.md"/>
                <toc-element toc-title="Use Spring Data CrudRepository" topic="jvm-spring-boot-using-crudrepository.md"/>
            </toc-element>
        </toc-element>
        <toc-element toc-title="Web development">
            <toc-element topic="web-overview.md"/>
            <toc-element toc-title="Kotlin/JS">
                <toc-element toc-title="Overview" topic="js-overview.md"/>
                <toc-element topic="js-get-started.md"/>
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                <toc-element topic="running-kotlin-js.md"/>
                <toc-element topic="dev-server-continuous-compilation.md"/>
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            <toc-element toc-title="WebAssembly (Wasm)">
                <toc-element toc-title="Overview" topic="wasm-overview.md"/>
                <toc-element topic="wasm-get-started.md"/>
                <toc-element topic="wasm-wasi.md"/>
                <toc-element topic="wasm-debugging.md"/>
                <toc-element topic="wasm-js-interop.md"/>
                <toc-element accepts-web-file-names="wasm-troubleshooting.html" topic="wasm-configuration.md"/>
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        </toc-element>
        <toc-element toc-title="Native development">
            <toc-element toc-title="Overview" topic="native-overview.md"/>
            <toc-element accepts-web-file-names="basic-kotlin-native-app.html,kotlin-native-with-clion.html,targeting-multiple-platforms.html,native-gradle.html,native-command-line-compiler.html" topic="native-get-started.md"/>
            <toc-element topic="native-libraries.md"/>
            <toc-element topic="native-platform-libs.md"/>
            <toc-element toc-title="Memory manager">
                <toc-element topic="native-memory-manager.md"/>
                <toc-element toc-title="Integration with ARC" accepts-web-file-names="native-ios-integration.html" topic="native-arc-integration.md"/>
                <toc-element toc-title="Migration guide" topic="native-migration-guide.md"/>
            </toc-element>
            <toc-element toc-title="Binary options" topic="native-binary-options.md"/>
            <toc-element topic="native-debugging.md"/>
            <toc-element toc-title="Target and host support" topic="native-target-support.md"/>
            <toc-element toc-title="Improving compilation time" topic="native-improving-compilation-time.md"/>
            <toc-element toc-title="Customizing LLVM passes" topic="native-llvm-passes.md"/>
            <toc-element toc-title="License files" topic="native-binary-licenses.md"/>
            <toc-element topic="native-faq.md"/>
        </toc-element>
        <toc-element toc-title="Android development" topic="android-overview.md"/>
        <toc-element toc-title="Designing your library">
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        <toc-element toc-title="Kotlin custom scripting" topic="custom-script-deps-tutorial.md"/>
        <toc-element toc-title="Development tooling">
            <toc-element toc-title="IDE for Kotlin development" accepts-web-file-names="getting-started-eclipse.html,eclipse.html" topic="kotlin-ide.md"/>
            <toc-element toc-title="Dokka">
                <include from="dokka.tree" origin="dokka" element-id="dokka"/>
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            <toc-element accepts-web-file-names="quick-run.html" topic="run-code-snippets.md"/>
            <toc-element toc-title="KDoc" topic="kotlin-doc.md"/>
            <toc-element toc-title="OSGi" topic="kotlin-osgi.md"/>
            <toc-element toc-title="TeamCity" topic="kotlin-and-ci.md"/>
            <toc-element hidden="true" toc-title="Migrate to Kotlin code style with IntelliJ IDEA" topic="code-style-migration-guide.md"/>
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    </toc-element>
    <toc-element toc-title="Interoperability">
        <toc-element toc-title="Java interop">
            <toc-element topic="comparison-to-java.md"/>
            <toc-element topic="java-interop.md"/>
            <toc-element topic="java-to-kotlin-interop.md"/>
            <toc-element topic="jvm-records.md"/>
            <toc-element toc-title="Java to Kotlin migration guides">
                <toc-element toc-title="Strings" topic="java-to-kotlin-idioms-strings.md"/>
                <toc-element toc-title="Collections" topic="java-to-kotlin-collections-guide.md"/>
                <toc-element toc-title="Nullability" topic="java-to-kotlin-nullability-guide.md"/>
                <toc-element topic="standard-input.md"/>
            </toc-element>
        </toc-element>
        <toc-element toc-title="JavaScript interop">
            <toc-element topic="browser-api-dom.md"/>
            <toc-element accepts-web-file-names="calling-javascript-from-kotlin.html" topic="js-interop.md"/>
            <toc-element topic="dynamic-type.md"/>
            <toc-element topic="using-packages-from-npm.md"/>
            <toc-element topic="js-to-kotlin-interop.md"/>
            <toc-element topic="js-modules.md"/>
            <toc-element topic="js-reflection.md"/>
            <toc-element topic="typesafe-html-dsl.md"/>
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        <toc-element toc-title="Swift/Objective-C and C interop">
            <toc-element toc-title="Swift/Objective-C interop">
                <toc-element topic="native-objc-interop.md"/>
                <toc-element topic="apple-framework.md"/>
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            <toc-element toc-title="Swift export" topic="native-swift-export.md"/>
            <toc-element toc-title="C interop">
                <toc-element topic="native-c-interop.md"/>
                <toc-element topic="mapping-primitive-data-types-from-c.md"/>
                <toc-element topic="mapping-struct-union-types-from-c.md"/>
                <toc-element topic="mapping-function-pointers-from-c.md"/>
                <toc-element topic="mapping-strings-from-c.md"/>
                <toc-element toc-title="Create a dynamic library – tutorial" topic="native-dynamic-libraries.md"/>
                <toc-element accepts-web-file-names="curl.html" topic="native-app-with-c-and-libcurl.md"/>
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            <toc-element topic="native-definition-file.md"/>
            <toc-element toc-title="External library import" accepts-web-file-names="native-c-interop-stability.html" topic="native-lib-import-stability.md"/>
        </toc-element>
    </toc-element>
    <toc-element toc-title="Kotlin for data analysis and AI">
        <toc-element toc-title="Kotlin for data analysis">
            <toc-element toc-title="Overview" accepts-web-file-names="data-science-overview.html" topic="data-analysis-overview.md"/>
            <toc-element topic="kotlin-notebook-overview.md" toc-title="Kotlin Notebook overview"/>
            <toc-element toc-title="Get started with Kotlin Notebook">
                <toc-element toc-title="Introduction to Kotlin Notebook" topic="get-started-with-kotlin-notebooks.md"/>
                <toc-element toc-title="1. Set up an environment" topic="kotlin-notebook-set-up-env.md"/>
                <toc-element toc-title="2. Create your first Kotlin Notebook" topic="kotlin-notebook-create.md"/>
                <toc-element toc-title="3. Add dependencies to a Kotlin Notebook" topic="kotlin-notebook-add-dependencies.md"/>
            </toc-element>
            <toc-element toc-title="Share a Kotlin Notebook" topic="kotlin-notebook-share.md"/>
            <toc-element toc-title="Output formats in Kotlin notebooks" topic="data-analysis-notebooks-output-formats.md"/>
            <toc-element toc-title="Working with data sources">
                <toc-element topic="data-analysis-work-with-data-sources.md"/>
                <toc-element topic="data-analysis-work-with-api.md"/>
                <toc-element topic="data-analysis-connect-to-db.md"/>
            </toc-element>
            <toc-element toc-title="Visualizing data">
                <toc-element toc-title="With Kandy" topic="data-analysis-visualization.md"/>
                <toc-element toc-title="With Lets-Plot for Kotlin" topic="lets-plot.md"/>
            </toc-element>
            <toc-element toc-title="Libraries for data analysis" topic="data-analysis-libraries.md"/>
        </toc-element>
        <toc-element toc-title="Kotlin for AI-powered apps">
            <toc-element toc-title="Overview" topic="kotlin-ai-apps-development-overview.md"/>
            <toc-element toc-title="Build a Kotlin app with Spring AI – tutorial" topic="spring-ai-guide.md"/>
        </toc-element>
    </toc-element>
    <toc-element toc-title="Library guides">
        <toc-element toc-title="Standard library">
            <toc-element toc-title="Collections">
                <toc-element toc-title="Overview" topic="collections-overview.md"/>
                <toc-element toc-title="Create" topic="constructing-collections.md"/>
                <toc-element toc-title="Traverse" topic="iterators.md"/>
                <toc-element toc-title="Order" topic="collection-ordering.md"/>
                <toc-element toc-title="Group" topic="collection-grouping.md"/>
                <toc-element toc-title="Transform" topic="collection-transformations.md"/>
                <toc-element toc-title="Filter" topic="collection-filtering.md"/>
                <toc-element toc-title="Retrieve">
                    <toc-element topic="collection-parts.md"/>
                    <toc-element topic="collection-elements.md"/>
                </toc-element>
                <toc-element toc-title="Operations and operators">
                    <toc-element toc-title="Operations overview" topic="collection-operations.md"/>
                    <toc-element topic="collection-aggregate.md"/>
                    <toc-element toc-title="Write operations" topic="collection-write.md"/>
                    <toc-element topic="list-operations.md"/>
                    <toc-element topic="set-operations.md"/>
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            <toc-element topic="read-standard-input.md"/>
            <toc-element topic="opt-in-requirements.md"/>
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        <toc-element toc-title="Coroutines (kotlinx.coroutines)">
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        <toc-element toc-title="Serialization (kotlinx.serialization)" topic="serialization.md"/>
        <toc-element toc-title="Kotlin Metadata JVM (kotlin-metadata-jvm)" topic="metadata-jvm.md"/>
        <toc-element toc-title="Lincheck (kotlinx.lincheck)">
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        <toc-element toc-title="Ktor" href="https://ktor.io/docs/welcome.html"/>
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    <toc-element toc-title="API reference">
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        <toc-element toc-title="Standard library (stdlib)" href="https://kotlinlang.org/api/latest/jvm/stdlib/"/>
        <toc-element toc-title="Test library (kotlin.test)" href="https://kotlinlang.org/api/latest/kotlin.test/"/>
        <toc-element toc-title="Coroutines (kotlinx.coroutines)" href="https://kotlinlang.org/api/kotlinx.coroutines/kotlinx-coroutines-core/"/>
        <toc-element toc-title="Serialization (kotlinx.serialization)" href="https://kotlinlang.org/api/kotlinx.serialization/kotlinx-serialization-core/"/>
        <toc-element toc-title="Kotlin I/O library (kotlinx-io)" href="https://kotlinlang.org/api/kotlinx-io/"/>
        <toc-element toc-title="Date and time (kotlinx-datetime)" href="https://kotlinlang.org/api/kotlinx-datetime/"/>
        <toc-element toc-title="JVM Metadata (kotlinx-metadata-jvm)" href="https://kotlinlang.org/api/kotlinx-metadata-jvm/"/>
        <toc-element toc-title="Ktor" href="https://api.ktor.io/"/>
        <toc-element toc-title="Kotlin Gradle plugins (kotlin-gradle-plugin)" href="https://kotlinlang.org/api/kotlin-gradle-plugin/"/>
        <toc-element toc-title="Compose Multiplatform Material3" href="https://kotlinlang.org/api/compose-multiplatform/material3/"/>
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    <toc-element toc-title="Build tools">
        <toc-element toc-title="Gradle">
            <toc-element accepts-web-file-names="using-gradle.html" toc-title="Overview" topic="gradle.md"/>
            <toc-element toc-title="Get started with Gradle – tutorial" topic="get-started-with-jvm-gradle-project.md"/>
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            <toc-element toc-title="Compiler options in KGP" topic="gradle-compiler-options.md"/>
            <toc-element toc-title="Compilation and caches in KGP" topic="gradle-compilation-and-caches.md"/>
            <toc-element toc-title="Multiplatform Gradle DSL" href="https://kotlinlang.org/docs/multiplatform/multiplatform-dsl-reference.html"/>
            <toc-element toc-title="Binary compatibility validation in KGP" topic="gradle-binary-compatibility-validation.md"/>
            <toc-element topic="gradle-plugin-variants.md"/>
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            <toc-element toc-title="Overview" accepts-web-file-names="using-maven.html" topic="maven.md"/>
            <toc-element toc-title="Configure project" topic="maven-configure-project.md"/>
            <toc-element toc-title="Compile and package" topic="maven-compile-package.md"/>
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        <toc-element topic="build-tools-api.md"/>
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    <toc-element toc-title="Compiler and plugins">
        <toc-element toc-title="Kotlin compiler">
            <toc-element accepts-web-file-names="k2-compiler-guide.html" topic="k2-compiler-migration-guide.md"/>
            <toc-element toc-title="Command-line compiler" topic="command-line.md"/>
            <toc-element toc-title="Create a console app" topic="jvm-get-started.md"/>
            <toc-element toc-title="Compiler options" topic="compiler-reference.md"/>
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            <toc-element toc-title="All-open" topic="all-open-plugin.md"/>
            <toc-element toc-title="kapt" topic="kapt.md"/>
            <toc-element toc-title="Lombok" topic="lombok.md"/>
            <toc-element toc-title="No-arg" topic="no-arg-plugin.md"/>
            <toc-element toc-title="Power-assert" topic="power-assert.md"/>
            <toc-element toc-title="SAM with receiver" topic="sam-with-receiver-plugin.md"/>
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        <toc-element toc-title="Compose compiler">
            <toc-element toc-title="Compiler migration guide" topic="compose-compiler-migration-guide.md"/>
            <toc-element toc-title="Compiler options" topic="compose-compiler-options.md"/>
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        <toc-element toc-title="Kotlin Symbol Processing API">
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            <toc-element toc-title="Quickstart" topic="ksp-quickstart.md"/>
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    <toc-element toc-title="Kotlin evolution and roadmap">
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        <toc-element toc-title="Language evolution principles" accepts-web-file-names="kotlin-evolution.html,compatibility-modes.html" topic="kotlin-evolution-principles.md"/>
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        <toc-element toc-title="Earlier Kotlin releases">
            <toc-element toc-title="Kotlin 2.2.x">
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                <toc-element toc-title="Kotlin 2.2.0" topic="whatsnew22.md"/>
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                <toc-element toc-title="Kotlin 2.1.0" topic="whatsnew21.md"/>
                <toc-element toc-title="Compatibility guide" topic="compatibility-guide-21.md"/>
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            <toc-element toc-title="Kotlin 2.0.x">
                <toc-element toc-title="Kotlin 2.0.20" topic="whatsnew2020.md"/>
                <toc-element toc-title="Kotlin 2.0.0" topic="whatsnew20.md"/>
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                <toc-element toc-title="Kotlin 1.9.0" topic="whatsnew19.md"/>
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            <toc-element toc-title="Language Committee guidelines" href="https://kotlinfoundation.org/language-committee-guidelines/"/>
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            <toc-element toc-title="Brand usage" href="https://kotlinfoundation.org/guidelines/"/>
            <toc-element toc-title="Kotlin Foundation FAQ" href="https://kotlinfoundation.org/faq/"/>
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            <toc-element toc-title="GSoC 2026" topic="gsoc-2026.md"/>
            <toc-element toc-title="GSoC 2025" topic="gsoc-2025.md"/>
            <toc-element toc-title="GSoC 2024" topic="gsoc-2024.md"/>
            <toc-element toc-title="GSoC 2023" topic="gsoc-2023.md"/>
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            <toc-element accepts-web-file-names="kug-branding.html" topic="kug-guidelines.md"/>
            <toc-element accepts-web-file-names="kotlin-nights-branding.html" topic="kotlin-night-guidelines.md"/>
            <toc-element topic="slack-code-of-conduct.md"/>
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        <toc-element accepts-web-file-names="kotlin-logo.html" topic="kotlin-brand-assets.md"/>
        <toc-element topic="kotlin-pdf.md"/>
        <toc-element topic="security.md"/>
        <toc-element toc-title="Press kit" href="https://kotlinlang.org/assets/kotlin-media-kit.pdf"/>
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