Interleaving two arrays in Javascript (using iterators & generators)

interleave.js

/**
 * interleave([1,2], [8,7,6,5], [], 'abc')
 * => [ 1, 8, 'a', 2, 7, 'b', 6, 'c', 5 ]
 */
function* interleave() {
  const its = Array.from(arguments).map(x => x[Symbol.iterator]());
  let done;
  do {
    done = true;
    for (const it of its) {
      const next = it.next();
      if (!next.done) {
        yield next.value;
        done = false;
      }
    }
  } while (!done)
}