generator.js

/**
 * @param {number} range
 */
function* generator (range) {
  let i = 0

  while (i < range) {
    i += 1
    yield i
  }
}

/**
 * @param {string | any[]} array
 */
function* each (array) {
  if (!Array.isArray(array)) return

  if (!array.length || array.length === 1) return

  let index = 0

  while (index < array.length) {
    yield array[index++]
  }
}

const gen1 = generator(10)
const gen2 = each([10, 1, 4, 6, 124, 56, 3, 6])