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JavaScript Debugging and Performance
Check your ability to optimize and debug JavaScript code effectively.
1. Which tool is most commonly used for debugging JavaScript in modern web browsers?
Sublime Text
Chrome DevTools
Notepad++
GitHub Desktop
2. Which of the following are common causes of JavaScript performance bottlenecks?
Unoptimized loops with excessive iterations
Frequent and unnecessary DOM manipulation
Using 'const' instead of 'var' for variable declaration
Memory leaks from unreleased object references
3. The 'console.log()' method is the most efficient and scalable way to debug complex JavaScript applications.
True
False
4. What is the primary performance metric assessed by Google's Lighthouse tool? (Answer with the key category)
5. What does the 'debugger' statement do in JavaScript?
Automatically fixes syntax errors
Pauses code execution at its location
Logs all variables to the console
Minifies the script for production
6. Which techniques help improve JavaScript runtime performance?
Debouncing rapid-fire event listeners (e.g., scroll/resize)
Using 'requestAnimationFrame' for smooth animations
Adding event listeners to every DOM element individually
Minifying and compressing JavaScript files
7. Memory leaks in JavaScript occur when objects that are no longer needed are still referenced by active code.
True
False
8. What keyboard shortcut is used to toggle a breakpoint in Chrome DevTools' Sources panel? (Answer with the key, e.g., 'f5')
9. Which console method measures the time taken for a block of code to execute?
console.trace()
console.time()
console.assert()
console.count()
10. Name the JavaScript engine used in Google Chrome that directly impacts execution performance.
Reset
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