asd dsa

const test = {
  a: { id: 1 },
  b: { id: 2 },
  c: [{ a: 1 }, { a: 2 }, { c: 3 }]
};

function* generLoop(elem) {
  // eslint-disable-next-line no-undef,no-restricted-syntax
  for (el of test[elem]) {
    // eslint-disable-next-line no-undef
    yield el;
  }
}

function createLoop(elem) {
  let gen;
  if (elem === 'c') {
    gen = generLoop(elem);
  }
  return () => (gen ? gen.next() : test[elem]);
}

const iterator = createLoop('c');
for (let i = 0; i < 3; i++) {
  console.log(iterator());
}