JavaScript Generators, Iterators, and function*: Pausing Execution Without Magic

Most explanations of function* stay at the syntax level. That’s the problem.

In this article, I break down the real difference between iterables, iterators, and generators in JavaScript, then connect yield and next() to a much stronger mental model: finite state machines.

You’ll see why generators are not automatic async behavior, not concurrency, and not “magic functions,” but a precise way to pause execution, preserve context, and resume a sequence on demand.

If you want to understand generators beyond memorizing syntax, this guide is for you.

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