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Kotlin Function Declaration

Functions are "self contained" modules of code that accomplish a specific task. Functions usually "take in" data, process it, and "return" a result. Once a function is written, it can be used over and over and over again. Functions can be "called" from the inside of other functions.. Functions organize the program into logical blocks of code. Once defined, functions may be called to access code. This makes the code reusable. Moreover, functions make it easy to read and maintain the program’s code.

Like other programming languages, Kotlin also allow creating customized functions.

To create a function in Kotlin we use syntax fun. See below Example to create a new function that prints Hello World:

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

fun main() {
  sayHelloWorld()
}

Output

Hello World

Kotlin Function Usage unlimited

In Kotlin you can call the function as many times you want. See example below which call the function 5 times:

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

fun main() {
  sayHelloWorld()
  sayHelloWorld()
  sayHelloWorld()
  sayHelloWorld()
  sayHelloWorld()
}

Output

Hello World
Hello World
Hello World
Hello World
Hello World


Conclusion

In this page (written and validated by ) you learned about Kotlin Function Declaration . What's Next? If you are interested in completing Kotlin tutorial, your next topic will be learning about: Kotlin Function Parameters.



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