Funções Geradoras e Geradoras Assíncronas em Javascript

The text explains iterators and iterables in JavaScript, both synchronous and asynchronous. An iterator is an object that accesses a collection one item at a time, requiring a `next()` method that returns `{ value, done }`. An iterable object has a `[Symbol.iterator]()` method that returns an iterator. The article demonstrates creating custom iterators and iterables with code examples. It then introduces asynchronous iterators and async iterables, which handle asynchronous data sources and involve Promises. The core concept of generator functions is presented as a simpler way to create iterators and iterables. Generator functions use the `function*` syntax and `yield` to produce values on demand. Asynchronous generator functions, using `async function*`, similarly yield values but return Promises, suitable for asynchronous operations. The text concludes with a practical example of using an asynchronous generator to process data from a file stream in Node.js. This example showcases how generators can transform data within a pipeline.