Learn KOTLIN-PLAYGROUND with Real Code Examples

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

A simple Hello World example in Kotlin Playground.

fun main() {
    val a = 5
    val b = 10
    println("Sum: ${a + b}")
}

Adds two numbers and prints the result.

fun main() {
    val num = -3
    if(num >= 0) {
        println("Positive")
    } else {
        println("Negative")
    }
}

A simple if-else example to check if a number is positive or negative.

fun main() {
    for(i in 1..5) {
        println(i)
    }
}

Prints numbers from 1 to 5 using a for loop.

fun main() {
    var i = 1
    while(i <= 5) {
        println(i)
        i++
    }
}

Prints numbers from 1 to 5 using a while loop.

fun greet(name: String) {
    println("Hello, $name")
}

fun main() {
    greet("Alice")
}

Defines a function to greet a user by name.

fun main() {
    val numbers = arrayOf(1, 2, 3, 4, 5)
    for(num in numbers) {
        println(num)
    }
}

Iterates over an array of integers and prints them.

fun main() {
    val fruits = listOf("Apple", "Banana", "Cherry")
    for(fruit in fruits) {
        println(fruit)
    }
}

Uses a list of strings and prints each element.

fun main() {
    val num = 2
    when(num) {
        1 -> println("One")
        2 -> println("Two")
        else -> println("Other")
    }
}

Uses a when expression to print messages based on a number.

fun main() {
    val name: String? = null
    println(name?.length ?: "Name is null")
}

Demonstrates nullable types and safe calls.