Overview of Kotlin

Kotlin is a modern programming language developed by JetBrains, designed to be fully interoperable with Java. It is statically typed and has a concise syntax, making it a popular choice for Android app development and server-side programming. Learn more at Kotlin Official Site.

Key Features of Kotlin:

Concise Syntax: Kotlin reduces boilerplate code, allowing developers to write more expressive code with fewer lines. Learn more
Null Safety: Kotlin has built-in null safety features to eliminate the null pointer exceptions that are common in other languages. Learn more
Extension Functions: Kotlin allows developers to extend existing classes with new functionality without having to inherit from them. Learn more
Coroutines: Kotlin supports coroutines, which help manage background tasks and concurrency with a simple syntax. Learn more
Interoperability with Java: Kotlin is fully compatible with Java, allowing developers to use existing Java libraries and frameworks seamlessly. Learn more

Basic Syntax

Here’s a simple example of Kotlin code:

fun main() {
        val message = "Hello, Kotlin!"
        println(message)
    }

This example demonstrates Kotlin's simple syntax for declaring a variable and printing it to the console using the println function.

Kotlin Examples:

Here are several beginner-friendly examples of Kotlin code:

1. Data Types

fun main() {
        val name: String = "Kotlin"
        val age: Int = 5
        val height: Double = 1.75
        val isFun: Boolean = true
    
        println("Name: $name, Age: $age, Height: $height, Is Fun: $isFun")
    }

This example illustrates the declaration of different data types in Kotlin. Learn more

2. Conditional Statements

Conditional statements help control the flow of the program:

fun checkAge(age: Int) {
        if (age >= 18) {
            println("You are an adult.")
        } else {
            println("You are a minor.")
        }
    }
    
    fun main() {
        checkAge(20) // Output: You are an adult.
    }

This example shows how to use an if-else statement to check the age. Learn more

3. Loops

Kotlin supports different types of loops, including for and while loops:

fun main() {
        for (i in 1..5) {
            println("Count: $i")
        }
    
        var count = 5
        while (count > 0) {
            println("Countdown: $count")
            count--
        }
    }

This example demonstrates a for loop and a while loop in Kotlin. Learn more

4. Functions

Functions in Kotlin can be defined using the fun keyword:

fun add(a: Int, b: Int): Int {
        return a + b
    }
    
    fun main() {
        println("Sum: ${add(3, 4)}") // Output: Sum: 7
    }

This example illustrates how to define and call a simple function in Kotlin. Learn more

5. Classes and Objects

Here's a basic example of defining a class and creating an object:

class Car(val model: String, val year: Int) {
        fun display() {
            println("Model: $model, Year: $year")
        }
    }
    
    fun main() {
        val myCar = Car("Toyota", 2020)
        myCar.display() // Output: Model: Toyota, Year: 2020
    }

This example demonstrates the creation of a class and instantiation of an object in Kotlin. Learn more

Input

Output