MainHub Lessons Game Overview
Let’s Go! Let’s Go! Let’s Go!

Data Types (Interactive Viewer)

Click a data type to learn more.

⭐ Overview: Data Types in Game Development

Data types are the fundamental building blocks of all programming. They define what kind of information your code is working with and determine how that information behaves. In game development, choosing the right data type isn’t just a technical detail — it affects performance, clarity, and how easily systems interact with each other.

Below is a deeper look at the core data types you’re using, along with how they appear in real game systems.

🔢 1. Number

Numbers represent any kind of numeric value: speed, health, position, timers, damage, and more.

Example

velocity: 3

Where It’s Used

  • Physics calculations
  • Movement speed
  • Animation timing
  • Hit detection
  • Cooldowns and timers

Numbers are the backbone of anything that changes over time. If something moves, rotates, jumps, or counts down, a number is behind it.

📝 2. String

Strings store text — but in games, they’re often used for labels, states, and paths rather than long sentences.

Example

"hostile"

Where It’s Used

  • NPC states ("idle", "patrol", "hostile")
  • File paths for sprites or audio
  • Dialogue or UI text
  • Identifiers for items, quests, or events

Strings help your game understand what something is or what mode it’s in.

✔️ 3. Boolean

Booleans represent true/false values — simple but incredibly powerful for controlling game logic.

Example

isPaused: true

Where It’s Used

  • Game loop control
  • Collision toggles
  • AI behavior flags
  • Visibility or invincibility states
  • Input handling

Booleans act like switches that turn features or behaviors on and off.

📦 4. Array

Arrays store lists of related items. In games, they’re essential for managing groups of objects.

Example

gameObjects[]

Where It’s Used

  • All active sprites in the scene
  • Lists of enemies, bullets, particles, or items
  • Pathfinding nodes
  • Inventory systems
  • Level data

Arrays let you loop through many objects and update them efficiently each frame.

🧩 5. JSON Object

JSON objects store structured data — perfect for configuration, settings, and anything with multiple properties.

Example

{ hitbox: { width: 40 } }

Where It’s Used

  • NPC configuration (speed, health, hitbox, AI settings)
  • Level definitions
  • Save files
  • Dialogue trees
  • Game settings

JSON objects let you group related information together in a clean, readable format.

🎯 Why Data Types Matter

Understanding data types helps you:

  • Write cleaner, more predictable code
  • Avoid bugs caused by mismatched values
  • Structure game systems more effectively
  • Communicate intent to other developers
  • Build scalable features that won’t break later

In game development, data types aren’t just technical details — they shape how your entire game behaves. Mastering them gives you control over movement, AI, physics, UI, and every system that makes your game come alive.