What is async/await in JavaScript?
Syntax for promises that lets you write async code that looks synchronous. await pauses the function until the promise settles, and async marks a function as returning a promise. Under the hood it is still promises, just cleaner syntax.
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More FAQs in JavaScript Closures, Event Loop, and Promises Interview Questions
A closure is a function that remembers the variables from where it was created. It matters for data privacy, callbacks, and functional patterns like once and memoize, since anything that 'remembers' state across calls uses closures.
Data privacy (encapsulating variables inside a factory function), callbacks like setTimeout, and patterns like once, memoize, and partial application. Anywhere you need to 'remember' state across calls without global variables uses closures.
How JavaScript handles async on a single thread. It processes the call stack, then microtasks like promises, then macrotasks like setTimeout and events. It matters because it explains the order async code runs.
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