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Kotlin Cheat Sheet

Print-ready cheat sheet for Kotlin, organized for fast lookup, study, and desk-side use

Source: Kotlin Documentation (kotlinlang.org)
License: MIT
Variants: 3 download options
Updated: 2026-03-27

Sample

What's in this cheat sheet

Hello World

fun main() {
    println("Hello, World!")
}

Variables

val name = "Kotlin"        // immutable (prefer)
var count = 0               // mutable
val pi: Double = 3.14159   // explicit type
const val MAX = 100         // compile-time constant

Basic Types

`Int, Long`	32-bit / 64-bit signed integers
`Double, Float`	64-bit / 32-bit floating point
`Boolean`	`true` / `false`
`Char`	Single Unicode character
`String`	Immutable text, supports templates
`Unit`	Equivalent to `void` (single value)
`Nothing`	Function never returns (e.g., throws)

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