Answers for "for in get index javascript"

js for of array with index

for (const [index, value] of [1, 2, 3, 4, 5].entries()) {
  console.log(index, value);
}

javascript enumerate with index

const iterable = [...];
for (const [index, elem] in iterable.entries()) {
  f(index, elem);
}

// or
iterable.forEach((elem, index) => {
  f(index, elem);
});