Best of Modern JavaScript — Iterators and Generators

Iterator clean up and basics of generator functions.

Since 2015, JavaScript has improved immensely.

It’s much more pleasant to use it now than ever.

In this article, we’ll look at JavaScript iterable objects and generator functions.

Clean Up of Generators

If we use break to break a loop, then we can clean up with the try-finally constructor.

For example, if we have:

function* genFn() {
  yield 'foo';
  yield 'bar';
  yield 'baz';
  console.log('clean up');
}
const gen = genFn();
for (const x of gen) {
  console.log(x);
}

Then the console log will run when the generator returned all the items.

However, if we use break in our loop:

for (const x of gen) {
  console.log(x);
  break;
}

Then the console log is never run.

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