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extends and variables

Learn to derive a class with extends Node and define variables.

The extends keyword

In GDScript, a script file typically begins with the extends statement. This keyword designates which Godot class the script inherits from.

extends Node
# This script now inherits all capabilities of a Node object

For instance, writing extends CharacterBody2D for a 2D character inherits built-in movement functions from that class.

Declaring variables with var

In GDScript, variables are declared using the var keyword. A variable can be directly assigned an initial value and modified throughout gameplay.

extends Node

var health = 100
var player_name = "Archer"
var is_alive = true

Variables store runtime data such as character health, ammo counts, or inventory items in memory.

Practice Print character variables

Assign "Hero" to name and "Knight" to role. Print Player: Hero | Role: Knight to the console.

Starter code

Player.cs
extends Node

func _ready():
    # name ve role degiskenlerini tanimlayip yazdir
    pass

Sample solution

Player.cs
extends Node

func _ready():
    var name = "Hero"
    var role = "Knight"
    print("Player: " + name + " | Role: " + role)

Expected output

Player: Hero | Role: Knight

Questions and answers

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

1 Which keyword in GDScript specifies which Godot class a script inherits from?

  • inherits
  • import
  • package
  • extends Correct answer

Explanation: extends is the inheritance keyword allowing GDScript classes to adopt capabilities from a superclass.

2 Declare speed variable

Question 
____ speed = 250
Answer 
var speed = 250

Explanation: In GDScript, the 'var' keyword is used to declare variables.

3 Inheritance and variable terms

Term Meaning
extends Statement to inherit from a class
var Keyword to declare a new variable
Node Base class for scene tree elements
health = 100 Assigning initial value to variable

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