JavaScript: Debugging & Error Handling Assessment

Online assessment to evaluate basic JavaScript debugging knowledge

This beginner-level assessment measures a candidate’s understanding of common JavaScript bugs, debugging patterns, and error-handling behaviors. It covers essential topics such as scoping issues, floating-point precision, asynchronous bugs, context binding, type coercion, reference copying, infinite loops, optional chaining, and switch fallthrough errors. Ideal for beginners, students, and entry-level developers, this assessment helps identify individuals who can recognize and fix typical JavaScript issues in real-world code.

Sample Question

Analyze this loop code: for (var i = 0; i < 3; i++) { setTimeout(() => console.log(i), 100); }. The developer expects output 0, 1, 2 but sees 3, 3, 3. What is the fix?