Best of Modern JavaScript — Yield

The yield keyword has many uses.

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 generators.

The yield Keyword

The yield keyword can only be used in generator functions.

For example, we can write:

function* genFn() {
  yield 'foo';
  yield 'bar';
  return 'baz';
}

But we can’t write:

function* genFn() {
  ['foo', 'bar'].forEach(x => yield x);
}

We’ll get a syntax error.

Recursion with yield*

The yield* keyword lets us call another generator function within a generator function.

For instance, we can write:

function* genFn() {
  yield 'foo';
  yield 'bar';
  yield 'baz';
}
function* bar() {
  yield 'x';
  yield* genFn();
  yield 'y';
}
const gen = bar()

to call the genFn generator function within the bar generator function.

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