JS iterators

chromium.log

low
high
__iterator__

firefox.log

3
4
5

opera.log

undefined
Unknown thread
low
Unknown thread
high
Unknown thread
__iterator__

range.js

  function Range(low, high) {
    this.low = low;
    this.high = high;
  }
  function RangeIterator(range) {
    this.range = range;
    this.current = this.range.low;
  } 
  RangeIterator.prototype.next = function() {
    if (this.current > this.range.high)
      throw StopIteration;
    else
      return this.current++;
  }
  Range.prototype.__iterator__ = function() {
    return new RangeIterator(this);
  };          
  var range = new Range(3, 5);
  for (var i in range)
    console.log(i);