jQuery jAM, Season 6

	 
function logFive(sequence) {
  for (var i = 0; i < 5; i++) {
    if (!sequence.next())
      	break;
    	console.log(sequence.current());
  		}
	}

function ArraySeq(array) {
	this.pos = -1;
	this.array = array;
	}

ArraySeq.prototype.next = function() {
  if (this.pos >= this.array.length - 1)
    return false;
  	this.pos++;
  	return true;
	};

ArraySeq.prototype.current = function() {
 	 return this.array[this.pos];
	};

function RangeSeq(from, to) {
	this.pos = from - 1;
	this.to = to;
	}

RangeSeq.prototype.next = function() {
  if (this.pos >= this.to)
    return false;
  	this.pos++;
  	return true;
	};

RangeSeq.prototype.current = function() {
	return this.pos;
	};


logFive(new ArraySeq([1,2]));
// ->1
//->2
logFive(new RangeSeq(100,1000));
// → 100
// → 101
// → 102
// → 103
// → 104