iterableStack.js

function iterableStack() {
  let arr = []
  return {
    push: (data) => arr.push(data),
    pop: () => arr.pop(),
    [Symbol.iterator]: function* () {
      let index = 0
      while (arr[index]) {
        yield arr[index]
        index++
      }
    },
  }
}

const stack = iterableStack()
stack.push(1)
stack.push(2)
stack.push(3)
stack.push(4)
stack.push(5)
console.log("pushed to stack values: 1, 2, 3, 4, 5")
console.log("popped from stack value:", stack.pop())

console.log("iterating stack:")
for (let item of stack) {
  console.log("   " + item)
}