JavaScript is notorious for its unexpected behaviors. Whether you are preparing for a frontend interview or just trying to sharpen your daily coding skills, you must master the fundamental quirks of the language.
In this guide, we break down some of the most highly-failed JavaScript questions from the CodeShot database. These questions specifically target unexpected outputs involving closures, hoisting, and object references.
1. The classic closure trap
Most junior developers expect this to behave symmetrically, but the event loop has other plans. Look closely at the execution context.
2. Type Coercion gone wrong
JavaScript's weakest link is often its loose typing. What exactly does the engine do when you try to manipulate undefined properties?
3. Floating Point Quirks
Simple math can sometimes break in JavaScript due to the IEEE 754 standard. This question catches almost everyone off guard.
How to improve your JavaScript confidence
The only way to build true confidence is repetition. Don't try to cram these concepts the night before an interview. By tackling one tricky JavaScript question every single day, your brain naturally rewires itself to spot these traps instantly.