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Type hints

Learn type hints in GDScript with the : marker.

Type Hints

GDScript is dynamically typed; however, placing a colon : after a variable name introduces static type hints. This enables the editor to catch type mismatch errors early while authoring code.

var player_name: String = "Hero"
var health: int = 100
var speed: float = 8.5
var is_active: bool = true

Type hints also significantly accelerate Godot's autocomplete and contextual documentation engine.

Type hints in functions

Beyond parameter typing, the exact return type of a function can be declared using the -> arrow. If the function returns no value, its return type is marked as void.

func add_health(current: int, bonus: int) -> int:
    return current + bonus

func reset_game() -> void:
    print("Reset")

This disciplined pattern maximizes maintainability and stability across large projects.

Practice Declare typed variables and print

Assign "Mage" to a String variable title and 5 to an int variable level. Print Title: Mage | Level: 5 to the console.

Starter code

Player.cs
extends Node

func _ready():
    # Tip belirtecleriyle title ve level tanimlayip yazdir
    pass

Sample solution

Player.cs
extends Node

func _ready():
    var title: String = "Mage"
    var level: int = 5
    print("Title: " + title + " | Level: " + str(level))

Expected output

Title: Mage | Level: 5

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 Which symbol is used right after the variable name in GDScript to explicitly add a type hint?

  • ->
  • =>
  • : (Colon) Correct answer
  • #

Explanation: A colon ':' placed immediately after a variable name declares the type acceptable for that variable.

2 Add integer type hint

Question 
var max_health: ____ = 100
Answer 
var max_health: int = 100

Explanation: In GDScript, the keyword 'int' is used for integer type hints.

3 Type hint elements

Term Meaning
Type Hint Hint declaring variable data type
String Type hint representing text data
int Type hint representing integers
-> Arrow indicating return type

All lessons in Beginner

1 What is game development?

  1. Intro to game development
  2. Game engines
  3. 2D and 3D games
  4. The game loop
  5. The scene concept
  6. Summary - Game dev fundamentals

2 Unity setup

  1. Installing Unity Hub
  2. Creating your first project
  3. The editor interface
  4. Toolbar and playback
  5. Saving the project
  6. Summary - Unity setup

3 First scene project

  1. Project overview
  2. Camera and light
  3. Your first cube in the scene
  4. Adding a material
  5. Testing in Play mode
  6. Summary - First scene

4 The GameObject concept

  1. What is a GameObject?
  2. Components
  3. The Hierarchy window
  4. Editing with the Inspector
  5. Tags and Layers
  6. Summary - GameObject

5 C# script basics

  1. Your first C# script
  2. using and namespace
  3. Class structure
  4. Variables and types
  5. Output with Debug.Log
  6. Summary - C# basics

6 MonoBehaviour

  1. What is MonoBehaviour?
  2. The Start method
  3. The Update method
  4. Awake vs Start
  5. SerializeField and public
  6. Summary - MonoBehaviour

7 Transform

  1. What is Transform?
  2. Changing position
  3. Moving with Translate
  4. Changing rotation
  5. Local vs world space
  6. Summary - Transform

8 Input

  1. The Input class
  2. Axis input
  3. Mouse input
  4. The new Input System
  5. Movement vector
  6. Summary - Input

9 Physics (Rigidbody/Collider)

  1. What is a Rigidbody?
  2. What is a Collider?
  3. Applying force with AddForce
  4. Collision events
  5. Trigger events
  6. Summary - Physics

10 2D Sprite

  1. What is a Sprite?
  2. SpriteRenderer
  3. Sprite import settings
  4. Sprite sorting
  5. Preparing sprite animation
  6. Summary - 2D Sprite

11 Godot basics

  1. The Godot editor
  2. A new project
  3. The scene tree
  4. The Node concept
  5. Saving the project
  6. Summary - Godot basics

12 GDScript

  1. What is GDScript?
  2. extends and variables
  3. Function definition
  4. Output with print
  5. Type hints
  6. Summary - GDScript

13 Node and Scene

  1. Node2D and Sprite2D
  2. Saving a scene
  3. Scene instance
  4. The _ready method
  5. The _process method
  6. Summary - Node and Scene

14 Beginner final

  1. Challenge 1: Print a score
  2. Challenge 2: Movement vector
  3. Challenge 3: Godot ready
  4. Challenge 4: Collision log
  5. Challenge 5: Final synthesis