10 JavaScript Output Questions That Look Innocent but Might Betray You in Interviews

The article explores common JavaScript interview questions designed to test a candidate's understanding of core engine concepts, not just syntax. It presents ten problems covering areas like array mutation in `forEach`, destructuring with default parameters, shallow copies using the spread operator, and the differences between `null` and `undefined`. The questions also delve into the event loop, particularly with `setTimeout` and `Promise.all`, and the unexpected behavior of `map(parseInt)`. Further topics include function vs. variable hoisting, closures within `setTimeout`, and arrow function's `this` binding. The solutions include detailed explanations, dry runs, and outputs, emphasizing the importance of understanding JavaScript's runtime behavior. The author encourages readers to see JavaScript as a runtime engine in order to succeed in interviews. They also offer resources such as a YouTube channel, Telegram and Discord communities.