JavaScript Generator Functions

A generator function can pause with yield and resume later, producing one value at a time.

Writing an iterator by hand, as in the first lesson, is fiddly to get right.

A generator writes the same thing as an ordinary-looking function.

Example

function* countTo(max) {
  for (let i = 1; i <= max; i++) {
    yield i;
  }
}

const counter = countTo(3);

console.log(counter.next());
console.log(counter.next());