ramil-k

const movies = {
  action: ['dark', 'aveng'],
  comedy: ['life', 'lights'],
  [Symbol.iterator]*() {
    for (let movies of Object.values(this)) {
      // option 1: 
      for (let movie of movies) {
        yield movie;
      }
      // option 2 (see https://developer.mozilla.org/ru/docs/Web/JavaScript/Reference/Statements/function* for details):