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🔢 Numbers

Using numeric values to track position, velocity, and score in a game

What Are Numbers Used For in Games?

Numbers are one of the most important data types in game development.
They control almost everything that moves, updates, or changes over time.

Common uses include:

• Position (where an object is)
• Velocity (how fast it moves)
• Score (player progress)
• Health, damage, timers, gravity, etc.

Numbers make your game world dynamic and interactive.

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Position

Position tells you where an object is in the game world.

Most games use:

• x → horizontal position
• y → vertical position

Example:

this.x = 100;
this.y = 200;

Changing these values moves the object.

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Velocity

Velocity tells you how fast and in what direction an object moves.

Example:

this.vx = 3;   // move 3 units per frame horizontally
this.vy = -2;  // move upward 2 units per frame

Velocity is usually applied to position each frame:

this.x += this.vx;
this.y += this.vy;

This is the foundation of movement in most games.

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Score Tracking

Score is a number that represents the player’s progress or achievements.

Example:

this.score = 0;

You update it as the player performs actions:

this.score += 10;   // gained points

Score tracking is essential for:

• Level progression
• Rewards
• High scores
• Win conditions

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Example Code (Simple & Clear)

class Player {
    constructor() {
        this.x = 100;     // position
        this.y = 200;
        this.vx = 3;      // velocity
        this.vy = 0;
        this.score = 0;   // score tracking
    }

    update() {
        // apply velocity to position
        this.x += this.vx;
        this.y += this.vy;
    }

    addScore(points) {
        this.score += points;
    }
}

This demonstrates:

• Numeric position
• Numeric velocity
• Numeric score
• How numbers update over time

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Why?

Working with numbers shows that you understand:

• How movement works
• How to update game state each frame
• How to track progress and gameplay events
• How to use math to control game behavior

Numbers are the backbone of almost every game mechanic.

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Strings

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