How do I iterate over enum values in Google Closure?

Question

I'm trying to find the best way to iterate over all of the values on an enum defined in Google Closure. Let's say I have the following enum defined:

/**
 * @enum {number}
 */
sample.namespace.Fruit = {
  Orange: 0,
  Apple: 1,
  Banana: 2
};

Right now, the best way I've seen to do this would be something like this:

for (var key in sample.namespace.Fruit) {
    var fruit = /** @type {sample.namespace.Fruit} */ (sample.namespace.Fruit[key]);
    // Make a smoothie or something.
}

I consider that painful to read. I'm listing a namespace three times just to get the compiler to come along for the ride. Is there another iteration technique that I should be using instead? Is this the best way to accomplish this form of iteration?

Answer 1

You can use goog.object.forEach to avoid namespace repetition.

goog.object.forEach(sample.namespace.Fruit,
                    function(value, key, allValues) {
                      // Make some delicious fruit jellies or something.
                    });

As a side note, in most cases you want to avoid using string keys for @enums so the compiler can rename those.

Answer 2

You can use a for loop to iterate over your objects..

var obj = sample.namespace.Fruit;

for(var key in obj) {
    console.log("Fruit :: " + key + " -- " + obj[key])
}

​Check Fiddle