Kotlin Tutorial

Kotlin is a statically-typed programming language that can run on the JVM.

Learn all about developing with Kotlin, through the articles here. We’ll start with a high-level introduction to the language, then go into more details about the core concepts, working with lambdas, testing, manipulating files, working with popular Kotlin libraries and more.

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Introduction

• Introduction to the Kotlin Language

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Core Concepts

• Guide to the “when{}” Block in Kotlin
• If-Else Expression in Kotlin
• Static Methods Behavior in Kotlin
• Void Type in Kotlin
• Comparator in Kotlin
• Kotlin Elvis Operator
• Comprehensive Guide to Null Safety in Kotlin
• Regular Expressions in Kotlin
• Try-with-resources in Kotlin
• Lazy Initialization in Kotlin
• Kotlin and Tail Recursion

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Classes and Objects

• Kotlin const, var, and val Keywords
• Objects in Kotlin
• Getters and Setters in Kotlin
• Sealed Classes in Kotlin
• Generics in Kotlin
• Reflection with Kotlin
• Working with Enums in Kotlin
• Data Classes in Kotlin
• Anonymous Objects in Kotlin
• Kotlin Companion Object

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Functions & Lambdas

• Lambda Expressions in Kotlin
• Returning Multiple Values From Kotlin Functions
• Introduction to Kotlin Coroutines
• Extension Functions in Kotlin
• Infix Functions in Kotlin
• Callback Functions in Kotlin
• Inline Functions in Kotlin
• Reified Functions in Kotlin

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Collections

• Kotlin Collections Guide

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Strings

• Kotlin Strings

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File Handling

• Reading from a File in Kotlin
• Writing to a File in Kotlin
• Creating a Directory in Kotlin
• Writing InputStream to File in Kotlin
• Kotlin Path API
• Read and Write to Excel With Kotlin
• Read and Write CSV Files With Kotlin
• IO and Default Dispatchers in Kotlin Coroutines

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Libraries & Plugins

• HTTP Requests with Kotlin and khttp
• Using Lombok With Kotlin
• Code Formatting in Kotlin Using Ktlint
• Jackson Support for Kotlin
• Moshi JSON Library for Kotlin Applications
• Guide to Kotlin-Logging
• gRPC and Kotlin
• Koin: Lightweight Dependency Injection Framework
• Mapstruct With Kotlin’s Data Classes
• An Introduction to kotlinx-serialization Project
• Kotlin with Ktor

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Testing

• JUnit 5 for Kotlin Developers
• Kotlin with Mockito
• Introduction to Kotest
• MockK: A Mocking Library for Kotlin
• A Guide to Kotlinx-Kover: a Kotlin Code Coverage Toolset

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Kotlin with Spring

• Spring Dependency Injection With Kotlin
• Spring Boot and Kotlin
• Kotlin and Spring Boot @ConfigurationProperties
• Kotlin and @Valid Spring Annotation
• Using the @Value Annotation in Kotlin
• Spring Webflux with Kotlin
• Log Request/Response Body in Spring WebFlux with Kotlin
• Non-Blocking Spring Boot with Kotlin Coroutines
• Using Swagger (OpenAPI) for a Spring REST API With Kotlin

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Kotlin and Java

• Java vs. Kotlin
• Convert Java to Kotlin
• Converting a Kotlin File to Java
• Java 8 Stream API Analogies in Kotlin
• Create a Java and Kotlin Project with Maven
• Creating Java static final Equivalents in Kotlin
• Convert Kotlin Array to Varargs
• Calling Kotlin Suspending Functions from Java

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