Functions

Table of Contents

• Functions
  • Definition
  • Giving
    • About
    • Usage

Functions

Definition

You can declare and define a function using the fn keyword, then the name of the function and then a list of argument declarations inside parenthesis. After the declaration, you must define a body for the function. Every statement is separated by a new line and the body ends with a semi colon. (see Syntax Rules)

import io

fn printInfo(string msg)
    io.writeLine("INFO: " + msg)
;

Giving

About

giving in Boink is what is called returning in other languages.

Usage

You can declare a give type using the arrow operator (->), if no give type was declared, the function doesn't have a give type (much like a void function in C).

There are 2 rules:

• If a function has a give type, it must give at some point.
• If a function doesn't have a give type, it can't return.

import io

fn input(string prompt) -> string
    io.write(prompt)
    give io.readLine()
;