List Iteration - Kotlin Typing CST Test
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List Iteration — Kotlin Code
Shows iterating over a list and using functional operations like map and filter.
fun main() {
val numbers = listOf(1, 2, 3, 4, 5)
val doubled = numbers.map { it * 2 }
val even = numbers.filter { it % 2 == 0 }
println("Original: $numbers")
println("Doubled: $doubled")
println("Even: $even")
}Kotlin Language Guide
Kotlin is a modern, statically typed programming language designed to improve developer productivity, safety, and interoperability, offering concise syntax, null-safety, coroutines, and seamless integration with the JVM, Android, and multiplatform ecosystems.
Primary Use Cases
- ▸Android application development
- ▸Backend APIs with Ktor or Spring Boot
- ▸Kotlin Multiplatform (KMP) shared logic
- ▸Desktop apps with Compose Multiplatform
- ▸Scripting and automation on JVM
- ▸Building DSLs and developer tooling
Notable Features
- ▸Null-safety and type inference
- ▸Coroutines for structured concurrency
- ▸Extension functions and DSL builders
- ▸Interoperability with Java
- ▸Kotlin Multiplatform compilation
- ▸Concise, expressive syntax
Origin & Creator
Created by JetBrains under the leadership of Dmitry Jemerov and Andrey Breslav. Announced in 2011 and open sourced in 2012. Officially backed by Google as the preferred language for Android in 2019. Evolved with coroutines, multiplatform support, KMM, inline classes, compiler optimizations, and modern functional features.
Industrial Note
Kotlin dominates modern Android development and is rapidly expanding into backend services (Ktor, Spring), multiplatform shared logic, DSL-based tooling, and enterprise JVM applications at companies like Google, Netflix, Amazon, Uber, Trello, and JetBrains.