accessor properties (getter/setters) used to create a simple iterators. Inspired by @eu96ne

accessor-iterator.js

/*
*  A limited example of using getters/setters as a way to iterate over a range
*  some background info at: freeman.blogspot.com/2013/07/javascript-getters-and-setters-last.html
*/

// Simple Array Iterator
//
// Expects array
var SimpleArrayIterator = function(arr){
  this.arr = arr;
  this.currentIdx = 0;
}
SimpleArrayIterator.prototype = {
  get next() {
    if(this.hasMore){
      return this.arr[this.currentIdx++];
    }
    else {
      throw new Error('Reached the End!');
    }
  },
  get hasMore(){
    return this.currentIdx < this.arr.length;
  },
  reset: function(){
    this.currentIdx = 0;
  }
}

//Usage:
var tags = ['vma', 'scandal', 'twerking'];

var tagIter = new SimpleArrayIterator(tags);

while(tagIter.hasMore){
  console.log(tagIter.next);
}

tagIter.next; // throws error
tagIter.reset();
tagIter.next; // returns 'vma'

accessor-rangeiterator.js

/*
*  A limited example of using getters/setters as a way to iterate over a range
*  some background info at: freeman.blogspot.com/2013/07/javascript-getters-and-setters-last.html
*/

// Simple Range Iterator
//
// Expects low and high or just high (assumes low is 0)

var SimpleRangeIterator = function(low, high){
  
  if(!high) {
    high = low;
    low = 0;
  }
  
  this.low = this.current = low;
  this.high = high;
}

SimpleRangeIterator.prototype = {
  get next(){
    if(this.current > this.high){
      throw new Error('Reached the End!');
    }
    else {
      return this.current++;
    }
  },
  get hasMore(){
    return this.current <= this.high;
  },
  reset: function(){
    this.current = this.low;
  }
}

// Usage:
var toTen = new SimpleRangeIterator(10);

while(toTen.hasMore){
  console.log(toTen.next);
}

toTen.next; // throws error
toTen.reset();
toTen.next; // returns 0

// or
var fiftyToSixty = new SimpleRangeIterator(50, 60);

while(fiftyToSixty.hasMore){
  console.log(fiftyToSixty.next);
}