ode.js ( and more recently io.js ) has put javascript as a programming language on a fast path. We have seen more improvements and advancement in the last 2 years that we have seen in the previous 2 decades. ECMAScript version 6 ( ES6 ) or `harmony` bring a lot of interesting and very useful features. One of the more useful, and oddly enough, confusing features is the introduction of generators and iterators.

The idea of generators and iterators are not unique to javascript. In fact that are fairly common in other programming languages. The Python language is very well know for it wide support for generator / iterator support. In fact it ships with module dedicated to creating and dealing with