The answer
Using one listener on a parent to handle events from many children, via event bubbling and the event target. It is efficient for large or dynamic lists and a common DOM interview topic.
A JavaScript Interview Cheat Sheet of Must-Know Topics
What is event delegation in a cheat sheet?
More FAQs in A JavaScript Interview Cheat Sheet of Must-Know Topics
let/const/var, hoisting and the temporal dead zone, closures, this, the event loop, promises, async/await, prototypes, equality (=== vs ==), and DOM events including event delegation and bubbling. Each is common in JS interviews.
Single-threaded JS handles async via the call stack, the microtask queue (promises), and the macrotask queue (setTimeout, events). Microtasks run before macrotasks, which is why promise callbacks run before setTimeout callbacks set at the same time.
Functions that remember their lexical scope, even after the outer function has returned. They enable data privacy, callbacks, and patterns like once and memoize.
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