Application Debugging

What is application debugging?

Application debugging is fixing problems in your entire application by identifying where things go wrong and why.

Benefits of application debugging?

• Find and fix application-wide issues
• Understand unexpected behavior
• Improve application reliability
• Track down complex bugs
• Learn what went wrong

// Track what's happening in the app
let gameRunning = true;
let playerHealth = 100;

// Log important events
console.log("Game started");

// Simulate damage
playerHealth -= 20;
console.log("Player health after damage: " + playerHealth);

// Check if critical
if (playerHealth < 30) {
    console.error("CRITICAL: Player health is low!");
}

// Check game status
if (gameRunning && playerHealth > 0) {
    console.log("Game continues - player alive");
} else {
    console.warn("Game may need to end");
}

What does this code do?

• Logs game start event
• Tracks player health changes
• Detects critical health situations
• Uses different log levels (log, warn, error)
• Shows how to monitor application state
• Helps identify where problems occur

// Debug a game loop
function gameLoop() {
    // Track frame count
    console.log("Frame: " + frameCount);
    
    // Check for errors
    try {
        updateGame();
        renderGame();
    } catch (error) {
        console.error("Game loop error:", error);
        gameRunning = false;
    }
    
    // Performance tracking
    console.time('game_update');
    // ... game update code ...
    console.timeEnd('game_update');
}

// Profile memory usage
console.log("Memory:", performance.memory);

What does this code do?

• Logs frame count for performance tracking
• Wraps game code in try-catch for error handling
• Logs errors when they occur
• Uses console.time() and console.timeEnd() to measure performance
• Monitors memory usage
• Shows comprehensive application debugging techniques

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layout: post title: Application Debugging description: Learn about application debugging permalink: /application_debugging author: Vihaan Budhraja —

Try It Yourself

%%js // CODE_RUNNER: application-debugging function gameLoop() { try { const player = { health: 100 }; const damage = 25; player.health -= damage; console.log(“Health: “ + player.health); } catch (error) { console.error(“Game error:”, error.message); } } gameLoop();