◆ JavaScript Patterns - Chapter 7. Design Patterns, Iterator

JavaScript Patterns

[Iterator]
object provides
o next()
o hasNext()
o rewind()
o current()

Simple implementaton using array

var agg = (function () {
var index = 0,
data = [1, 2, 3, 4, 5],
length = data.length;

return {
next: function () {
var element;
if (!this.hasNext()) {
return null;
}
element = data[index];
index = index + 2;
return element;
},
hasNext: function () {
return index < length; }, rewind: function () { index = 0; }, current: function () { return data[index]; } } }); while (agg.hasNext()) { console.log(agg.next()); }