Functions

Function definitions are slightly more complicated with between 3 and 6 values.

Syntax

fun 'name'{(arguments)}{: 'return type'} {
  'function body'
  {=> 'return expression'}
}

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1. fun

• All functions start with the fun keyword.

2. name

• Function names must follow lowerCamelCase naming standards.

3. arguments ^(optional)

• Functions do not have to accept arguments, in which case parentheses can be omitted.
• Arguments of the same type that follow each other can have their type omitted until the last value.

4. return type ^(optional)

• Functions do not have to return a value, in which case the type can be omitted.

5. function body

• Function bodies can be entirely empty or contain any number of properties, expressions, and control flow.

6. return expression

• Return expressions must be the final declaration of a function that returns a value, starting with =>

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Examples

function without arguments or a return value:

fun pushHelloWorld {
  push "Hello World"
}

function with both arguments and a return value:

fun addTwoNumbers(arg0: Int, arg1: Int): Int {
  => arg0 + arg1
}

// can also be written as

fun addTwoNumbers(arg0, arg1: Int): Int {
  => arg0 + arg1
}