yield from a list of generators created from an array

Answer 1

You could reduce array to generator. But this looks worse than for loop to me (though is functional :) )

var obj = [1, 2, 3, [4, 5, [6, 7, 8], 9], 10]

function* flat(x) {
  if (Array.isArray(x))
    yield * x.reduceRight(
      (f, y) => function*() {
        yield * flat(y);
        yield * f()
      },
      function*() {}
    )()
  else
    yield 'foo' + x;

}

console.log([...flat(obj)])