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🔘 Boolean Expressions

Compound conditions in game logic

What Are Boolean Expressions?

A Boolean expression is anything that evaluates to either:

• true
• false

Games rely on Boolean logic constantly — every decision the game makes is based on conditions:

• Is the player touching the ground?
• Is the enemy close enough to attack?
• Is the score high enough to unlock the next level?

Boolean expressions are the foundation of all branching game logic.

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Simple Boolean Conditions

A simple condition checks one thing:

if (player.y > groundLevel) { ... }
if (health <= 0) { ... }
if (keyPressed === "Space") { ... }

These are the building blocks of more complex logic.

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Compound Conditions

Compound conditions combine multiple checks using:

• && (AND)

• **

  ** (OR)

• ! (NOT)

These allow your game to make smarter decisions.

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AND (&&)

All conditions must be true.

Example: Player can jump only if they are on the ground AND not stunned.

if (player.onGround && !player.isStunned) {
    player.jump();
}

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OR (||)

At least one condition must be true.

Example: Player can move left using A OR Left Arrow.

if (keys["ArrowLeft"] || keys["a"]) {
    player.x -= player.speed;
}

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NOT (!)

Flips true → false or false → true.

Example: Enemy moves only when not frozen.

if (!enemy.isFrozen) {
    enemy.updateMovement();
}

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Combining Multiple Conditions

Game logic often needs several checks at once.

Example: Player takes damage only if:

• They collide with an enemy
• AND they are not invincible
• AND the enemy is active

if (player.collidesWith(enemy) &&
    !player.invincible &&
    enemy.active) {
    player.takeDamage(10);
}

This is a realistic compound condition used in many engines.

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Example: Platformer Movement Logic

// Player can jump if:
// 1. W or Space is pressed
// 2. AND the player is on the ground
// 3. AND the player is not sliding

if ((keys["w"] || keys[" "]) &&
    player.onGround &&
    !player.isSliding) {
    player.jump();
}

This shows how Boolean expressions control gameplay flow.

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Example: Level Completion Logic

if (player.x >= goal.x &&
    player.y <= goal.y + 20 &&
    score >= requiredScore) {
    level.complete();
}

The level only completes when all conditions are satisfied.

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Why?

Boolean expressions demonstrate that you understand:

• How to combine multiple conditions
• How to control game behavior with logic
• How to write readable, structured decision code
• How to prevent bugs by checking all required states
• How real game engines make decisions every frame

Boolean logic is the backbone of gameplay programming.

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