yangsu

function *productHelper(lists, prefix = []) {
  if (lists.length === 0) {
    yield [];
  } else {
    const [head, ...rest] = lists;
    for (let item of head) {
      const newPrefix = prefix.concat(item);
      if (rest.length) {
        yield *productHelper(rest, newPrefix);
      } else {

xem

codegolf JS

Mini projects by Maxime Euzière (xem), subzey, Martin Kleppe (aemkei), Mathieu Henri (p01), Litterallylara, Tommy Hodgins (innovati), Veu(beke), Anders Kaare, Keith Clark, Addy Osmani, bburky, rlauck, cmoreau, maettig, thiemowmde, ilesinge, adlq, solinca, xen_the,...

(For more info and other projects, visit http://xem.github.io)

(Official Slack room: http://jsgolf.club / join us on http://register.jsgolf.club)