Get the object length in angularjs is undefined

Question

How can I get the object length ?

In console my object looks like this:

Object {
 2: true,
 3: true,
 4: true
}

.length will give me undefined. I just want to get the results = 3 for this case.

Answer 1

var keys = Object.keys(objInstance);
var len = keys.length;

Where len is your "length."

There may be circumstances I haven't thought of where this doesn't work, but it should do what you need, given your example.

Answer 2

Combining some of these answers into

app.filter('numkeys', function() {
  return function(object) {
    return Object.keys(object).length;
  }
});

seems to work

<div ng-show="(furry.animals | numkeys) > 10">lots of furry animals</div>