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rated 0 times [ 23] [ 1] / answers: 1 / hits: 55811 / 11 Years ago, sat, april 6, 2013, 12:00:00

I have an array like so

var updates = [];

I then add stuff to the array like this

updates[func1] = function () { x += 5 };

When I call the functions with a for loop it works as expected

for(var update in updates) {

     updates[update]();

}

But when I use the forEach it doesn't work!?

updates.forEach(function (update) {



    update();

});

forEach definitely works in my browser which is google chrome, what am I doing wrong?

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answered 11 Years ago jimmiejudahm · Accepted Answer

forEach iterates over indexes not over properties. Your code:

updates[func1] = something;

Adds a property to an object – that incidentally is an array – not an element to an array.
In fact, it's equivalent to:

updates.func1 = something;

If you need something like an hashmap, then you can use a plain object instead:

updates = {};



updates[func1] = something;

And then iterate using for…in, that shouldn't be used on arrays

Or you can use Object.keys to retrieve the properties an iterate over them:

Object.keys(updates).forEach(function(key) {

    console.log(key);

});