Nested Conditionals

What are nested conditionals?

Nested conditionals are if statements inside other if statements. They let you check conditions based on the results of previous conditions.

Benefits of nested conditionals?

• Handle complex decision trees
• Only check certain conditions when others are true
• Create multi-level game logic
• Reduce unnecessary checks
• Build hierarchical decision structures

const playerHealth = 50;
const hasWeapon = true;
const targetDistance = 5;
const weaponRange = 10;

if (playerHealth > 0) {
    console.log("Player is alive");
    
    if (hasWeapon) {
        console.log("Player has a weapon");
        
        if (targetDistance <= weaponRange) {
            console.log("Target is in range!");
            console.log("ATTACK!");
        } else {
            console.log("Target is too far away");
        }
    } else {
        console.log("Player has no weapon");
    }
} else {
    console.log("Player is dead");
}

What does this code do?

• First if checks if player is alive
• Inside that, second if checks if player has weapon
• Inside that, third if checks if target is in range
• Each level only runs if all previous conditions were true

// Game state logic
const isPlaying = true;
const isPaused = false;

if (isPlaying) {
    if (!isPaused) {
        console.log("Game is running - update game objects");
    } else {
        console.log("Game is paused");
    }
}

What does this code do?

• First checks if game is playing
• Then checks if game is NOT paused
• Only runs game update code if both conditions are true
• Shows practical game state management
• Prevents updates when game is paused or not running

Try It Yourself

%%js // CODE_RUNNER: nested-conditionals const level = 2; const health = 80; if (level > 1) { if (health > 50) { console.log(“Ready for boss”); } else { console.log(“Heal first”); } }