This time we look at functions.
Let’s take a simple function from Java:
public int mult(int num1, int num2){
return num1 * num2;
}
In Kotlin it would look like this:
fun mult(num1: Int, num2: Int): Int{
return num1 * num2
}
- A function definition always starts with the keyword fun. That’s fun isn’t it?
fun mult
- A function is public per default so no need for the public keyword
- The types of the argument are written behind the argument name separated by a colon which looks similar to Python’s type hints
fun add(num1: Int, num2: Int)
- The function’s return type is added after the arguments
fun mult(num1: Int, num2: Int): Int {
- And last but not least a function has a body:
fun mult(num1: Int, num2: Int): Int {
return num1 * num2
}
Single expression functions
When the function body returns a single expression, you can leave out the cruly braces:
fun add(num1: Int, num2: Int): Int = num1 + num2
