typedArray.@@iterator

arr[Symbol.iterator]()

var arr = new Uint8Array([10, 20, 30, 40, 50]
// your browser must support for..of loop
// and let-scoped variables in for loops
for (let n of arr) {
  console.log(n
}

var arr = new Uint8Array([10, 20, 30, 40, 50]
var eArr = arr[Symbol.iterator](
console.log(eArr.next().value // 10
console.log(eArr.next().value // 20
console.log(eArr.next().value // 30
console.log(eArr.next().value // 40
console.log(eArr.next().value // 50