How to simulate JavaScript yield?

Question

One of the new mechanisms available in JavaScript 1.7 is yield, useful for generators and iterators.

This is currently supported in Mozilla browsers only (that I\'m

Answer 1

Similar to Pointy's answer, but with a hasNext method:

MyList.prototype.iterator = function() { //MyList is the class you want to add an iterator to

    var index=0;
    var thisRef = this;

    return {
        hasNext: function() {
            return index < thisRef._internalList.length;
        },

        next: function() {
            return thisRef._internalList[index++];
        }
    };
};

The hasNext method let's you loop like:

var iter = myList.iterator() //myList is a populated instance of MyList
while (iter.hasNext())
{
    var current = iter.next();
    //do something with current
}