Implementing iterators in JavaScript

iterators.js

function iterators (list) {
  var index = 0;
  return function () {
    return list[index++];
  }
}

var v;

var str = "hello world!";
var itStr = iterators(str);

console.log('Begin to iterate the string');
while (v = itStr()) {
  console.log(v);
}

var arr = ['a', 'b', 'c'];
var itArr = iterators(arr);

console.log('Begin to iterate the array');
while (v = itArr()) {
  console.log(v);
}

/* Outputs:
Begin to iterate the string
h
e
l
l
o
 
w
o
r
l
d
!
Begin to iterate the array
a
b
c
*/