Introduction
Kotlin is a modern language for web and Android with concise syntax.
Read more →Welcome to Kotlin Web Dev!
Explore free Kotlin tutorials and resources. Perfect for beginners and intermediate learners. Start coding today!
Basics
Installation
Kotlin installation uses SDKMAN or IntelliJ for compiler setup.
Read more →Running Code
Kotlin code runs via kotlinc or IntelliJ with .kt files.
Read more →Syntax
Kotlin syntax uses semicolons optionally with null safety.
Read more →Variables
Kotlin variables use var and val for mutability and immutability.
Read more →Data Types
Kotlin data types include Int String and Boolean with type inference.
Read more →Type Inference
Kotlin type inference reduces explicit type declarations for clarity.
Read more →Null Safety
Kotlin null safety uses ? and !! for safe nullable types.
Read more →Operators
Kotlin operators include arithmetic and Elvis operator for nulls.
Read more →If Else
Kotlin if-else statements double as expressions with type safety.
Read more →When
Kotlin when expressions replace switch with pattern matching.
Read more →Loops
Kotlin loops use for and while with break and continue.
Read more →Comments
Kotlin comments use // and /* */ with KDoc for documentation.
Read more →Errors
Kotlin errors use try-catch with typed exceptions for safety.
Read more →Debugging
Kotlin debugging uses IntelliJ with breakpoints and logging.
Read more →Best Practices
Kotlin best practices include null safety, concise functions.
Read more →Security Basics
Kotlin security ensures safe input handling for web APIs.
Read more →Packages
Kotlin packages organize code with import statements.
Read more →Gradle
Kotlin Gradle builds projects with build.gradle.kts for dependencies.
Read more →println
Kotlin println outputs to console with string templates.
Read more →Functions
Functions
Kotlin functions use fun with typed parameters and returns.
Read more →Default Arguments
Kotlin default arguments provide fallback values in functions.
Read more →Named Arguments
Kotlin named arguments improve readability in function calls.
Read more →Extension Functions
Kotlin extension functions add methods to existing classes.
Read more →Lambda Expressions
Kotlin lambda expressions use { } for concise function literals.
Read more →Higher-Order Functions
Kotlin higher-order functions pass functions as arguments.
Read more →Inline Functions
Kotlin inline functions reduce lambda overhead at compile-time.
Read more →Tail Recursion
Kotlin tail-recursive functions use tailrec for optimization.
Read more →Function Types
Kotlin function types define signatures with () -> Unit.
Read more →Classes
Classes
Kotlin classes use class with properties and methods.
Read more →Data Classes
Kotlin data classes auto-generate equals and toString.
Read more →Object Declarations
Kotlin object declarations create singletons with init blocks.
Read more →Companion Objects
Kotlin companion objects define static-like members in classes.
Read more →Inheritance
Kotlin inheritance uses open classes with override methods.
Read more →Interfaces
Kotlin interfaces define contracts with default implementations.
Read more →Abstract Classes
Kotlin abstract classes provide blueprints with abstract members.
Read more →Sealed Classes
Kotlin sealed classes restrict inheritance for type safety.
Read more →Enums
Kotlin enums define constants with properties and methods.
Read more →Properties
Kotlin properties use val and var with custom getters/setters.
Read more →Data Structures
Arrays
Kotlin arrays use Array with typed elements.
Read more →Lists
Kotlin lists use List and MutableList for immutable/mutable data.
Read more →Maps
Kotlin maps use Map and MutableMap for key-value pairs.
Read more →Sets
Kotlin sets use Set and MutableSet for unique elements.
Read more →Sequences
Kotlin sequences process data lazily for efficiency.
Read more →Concurrency
Coroutines
Kotlin coroutines enable asynchronous programming with suspend functions.
Read more →Suspending Functions
Kotlin suspending functions use suspend for async operations.
Read more →Coroutine Scope
Kotlin coroutine scopes manage coroutine lifecycles with GlobalScope.
Read more →Flow
Kotlin Flow handles reactive streams with async data emission.
Read more →Channels
Kotlin Channels enable coroutine communication with send/receive.
Read more →File I/O
File Reading
Kotlin file reading uses File.readText with try-catch.
Read more →File Writing
Kotlin file writing uses File.writeText with buffered writers.
Read more →File Paths
Kotlin file paths use java.nio.file.Path for cross-platform handling.
Read more →File Deletion
Kotlin file deletion uses File.delete with error checks.
Read more →HTTP
HTTP Server
Kotlin HTTP server uses Ktor for scalable web apps.
Read more →HTTP Client
Kotlin HTTP client uses Ktor client for API calls.
Read more →HTTP Routing
Kotlin HTTP routing uses Ktor for defining endpoints.
Read more →JSON
JSON Handling
Kotlin JSON handling uses kotlinx.serialization for encoding.
Read more →JSON Serialization
Kotlin JSON serialization uses Json.encodeToString with data classes.
Read more →JSON Deserialization
Kotlin JSON deserialization uses Json.decodeFromString with types.
Read more →Web Development
Ktor Framework
Kotlin Ktor framework builds async web apps with routing.
Read more →Spring Boot
Kotlin Spring Boot creates REST APIs with typed endpoints.
Read more →REST APIs
Kotlin REST APIs use Ktor or Spring Boot with JSON responses.
Read more →GraphQL APIs
Kotlin GraphQL APIs use graphql-kotlin for typed queries.
Read more →WebSockets
Kotlin WebSockets use Ktor for real-time communication.
Read more →Authentication
Kotlin authentication uses JWT or OAuth for secure APIs.
Read more →Environment Variables
Kotlin environment variables use System.getenv for config.
Read more →CORS
Kotlin CORS enables cross-origin requests with Ktor middleware.
Read more →Databases
Exposed
Kotlin Exposed provides SQL DSL for typed database queries.
Read more →PostgreSQL
Kotlin PostgreSQL uses Exposed or JDBC for typed queries.
Read more →MongoDB
Kotlin MongoDB uses kmongo for document-based data.
Read more →Redis
Kotlin Redis uses Jedis for caching and sessions.
Read more →Database Transactions
Kotlin database transactions use Exposed for atomic operations.
Read more →Logging
Logging
Kotlin logging uses SLF4J or Ktor logging for structured logs.
Read more →Error Logging
Kotlin error logging captures exceptions with Logback.
Read more →Request Logging
Kotlin request logging tracks API calls with Ktor middleware.
Read more →Testing
Testing
Kotlin testing uses Kotest or JUnit with test annotations.
Read more →Unit Testing
Kotlin unit testing uses assertThat for function tests.
Read more →Integration Testing
Kotlin integration testing validates APIs with Ktor client.
Read more →Mocking
Kotlin mocking uses MockK for isolated unit tests.
Read more →Property Testing
Kotlin property testing uses Kotest for random inputs.
Read more →Examples
REST API
Kotlin REST API with Ktor handles CRUD with JSON responses.
Read more →GraphQL API
Kotlin GraphQL API with graphql-kotlin supports typed queries.
Read more →Real-Time Chat
Kotlin real-time chat uses Ktor WebSockets for messaging.
Read more →Authentication API
Kotlin authentication API uses JWT for secure endpoints.
Read more →Database CRUD
Kotlin database CRUD with Exposed handles data operations.
Read more →Coroutine API
Kotlin coroutine API uses Ktor with suspend functions.
Read more →API Testing
Kotlin API testing with Ktor client validates REST endpoints.
Read more →Logging Setup
Kotlin logging setup with SLF4J logs requests and errors.
Read more →Dockerized App
Kotlin Dockerized app uses Dockerfile for deployment.
Read more →Spring Boot API
Kotlin Spring Boot API handles REST with typed endpoints.
Read more →Explore Our Tools
Kotlin Code Commenter
This page provides the Kotlin Code Commenter tool. Utilize it for your tasks.
Go to tool →Kotlin Code Formatter
This page provides the Kotlin Code Formatter tool. Utilize it for your tasks.
Go to tool →Kotlin Coroutine Explainer
This page provides the Kotlin Coroutine Explainer tool. Utilize it for your tasks.
Go to tool →Kotlin Error Explainer
This page provides the Kotlin Error Explainer tool. Utilize it for your tasks.
Go to tool →Kotlin Function Reference
This page provides the Kotlin Function Reference tool. Utilize it for your tasks.
Go to tool →Kotlin KDoc Generator
This page provides the Kotlin KDoc Generator tool. Utilize it for your tasks.
Go to tool →Kotlin Null Safety Analyzer
This page provides the Kotlin Null Safety Analyzer tool. Utilize it for your tasks.
Go to tool →Kotlin to Java Converter
This page provides the Kotlin to Java Converter tool. Utilize it for your tasks.
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