fun() { ... } is a function in Kotlin. The function is needed to perform an action.

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Kotlin

fun() { ... } is a function in Kotlin

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обновлено: 12 July 2026

The function is needed to perform an action.

Example 1

Function
input parameters NO
return value NO

Kotlin

fun Name()
{
}

Full example: Creating a new console application in Kotlin...

Kotlin

// My Function
fun showWeather()
{
     println("today 20 degree");
}

fun main() {
     showWeather() // call my function
     // on the screen we will see: today 20 degree
}

Example 2

Function
input parameters YES
return value NO

Kotlin

fun Name( parameter1:Type1, parameter2:Type2)
{
}

Full example: Creating a new console application in Kotlin...

Kotlin

// My Function
fun showMessage( text1:String, text2:String )
{
     println("$text1 | $text2");
}

fun main() {
     showMessage("Hello", "thank you") // call my function
     // on the screen we will see: Hello | thank you
}

Example 3

Function
input parameters NO
return value YES

Kotlin

fun Name():type
{
return
}

Option 2. You can do it like this:

Kotlin

fun Name():type =

Full example: Creating a new console application in Kotlin...

Kotlin

// My Function
fun priceBook(): Int
{
     return 20
}

fun main() {
     val my1:Int = priceBook() // call my function and get the result
     println(my1) // on the screen we will see: 20
}

Option 2. You can do it like this:
Put = after the function and this is how the result will be returned

Kotlin

// My Function
fun priceBook(): Int = 20

fun main() {
val my1:Int = priceBook() // call my function and get the result
println(my1) // on the screen we will see: 20
}

Example 4

Function
input parameters YES
return value YES

Kotlin

fun Name( parameter1:Type1, parameter2:Type2):type
{
return
}

Option 2. You can do it like this:

Kotlin

fun Name( parameter1:Type1, parameter2:Type2):type =

Full example: Creating a new console application in Kotlin...

Kotlin

// My Function
fun calculateSum(a:Float, b:Float): Float
{
     return a + b
}

fun main() {
     val my1 = calculateSum(1.2f, 3f) // call my function and get the result
     println(my1) // on the screen we will see: 4.2
}

Option 2. You can do it like this:
Put = after the function and this is how the result will be returned

Kotlin

// My Function
fun calculateSum(a:Float, b:Float): Float = a+b

fun main() {
val my1 = calculateSum(1.2f, 3f) // call my function and get the result
println(my1) // on the screen we will see: 4.2
}

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Lambda function in Kotlin. Example 1: var myFunc1 : (a:Int, b:Int) -> Int = { p1, p2 -> p1 + p2 };