Function definition

Learn to define functions with func.

Function definition and func

In GDScript, functions are defined using the func keyword. After the function name, parameter parentheses and a terminating colon : are placed; the body is indented.

func jump():
    print("Character jumped!")

func take_damage(amount):
    print("Damage taken!")

Functions break repetitive code routines into modular, reusable building blocks.

Parameters and return usage

Functions can accept input parameters and send calculated results back to the caller using the return statement.

func get_welcome_message(player_name):
    return "Welcome, " + player_name

func _ready():
    var msg = get_welcome_message("Warrior")
    print(msg)

Returned values can be leveraged directly in subsequent calculations or UI label displays.

Exercise Generate greeting text with function

Write a function named greet(hero_name) that returns "Hello, " + hero_name. In _ready, call this function with "Hero" and print the returned value with print.

Show example solution

extends Node

func greet(hero_name):
    return "Hello, " + hero_name

func _ready():
    var message = greet("Hero")
    print(message)

Test yourself

Which keyword is used to declare a new function in GDScript?
- void
- func
- function
- def
Show answer

func — In GDScript, function definitions are invariably declared using the 'func' keyword.

Complete function header

____ add_score(points):

Show answer

func add_score(points):

Function components

func

Keyword to declare a function
parameters

Input arguments passed to a function
return

Command returning result to caller
: (Colon)

Colon starting the function body

Next lesson: Output with print

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