The answer
Because === vs == confusion causes real bugs. Type coercion, like '0' == 0 being true, surprises many developers. Knowing coercion rules and using === prevents bugs and is a standard interview topic.
JavaScript Fundamentals Interview Questions You Can't Skip
Why do equality and coercion come up in JavaScript interviews?
More FAQs in JavaScript Fundamentals Interview Questions You Can't Skip
let/const/var, arrow vs regular functions, closures, the event loop and async, promises and async/await, prototypes and this, and equality and coercion. These come up in almost every JS interview.
Because they are foundational and tested in almost every JS interview. Closures enable data privacy, callbacks, and patterns like once and memoize, so understanding them is essential for any non-trivial JavaScript.
Arrow functions do not have their own this or arguments, and cannot be used as constructors. They inherit this from the surrounding scope, which is why they are common in callbacks. Regular functions have their own this.
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