forEachVariations.js

// Playing around with some different ways of doing for loops
// `forEachIterableProtocol` was the main toy I got to play with

function forEachIterableProtocol (array, action) {
  for (let i = array[Symbol.iterator](), obj = i.next(); !obj.done; obj = i.next()) {
    action(obj.value)
  }
}

function forEachNormal (array, action) {
  for (let i = 0; i < array.length; i++) {
    action(array[i])
  }
}

function forEachIn (array, action) {
  for (const item in array) {
    action(item)
  }
}

function forEachOf (array, action) {
  for (const item of array) {
    action(item)
  }
}