node js objectforeach index code example

Example 1: javascript enumerate with index

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

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

Example 2: mdn foreach

arr.forEach(callback(currentValue [, index [, array]])[, thisArg])