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    <p>You're not using an array as an array anymore in your example. Arrays in JS are (strictly speaking) only a bunch of stuff like this:</p> <p><code>['a', 'b', 'c']</code></p> <p>What you've done is started to use the empty array as an object.. the [ ] simple accesses a property via a string/variable... so</p> <pre><code>var obj = {test: 'blah'} obj['test'] //is 'blah' obj.test //is also blah </code></pre> <p>Generally the [ ] notation is used when you're going to access properties or methods via a variable or if the property or method is not something that is 'safe'.. for instance 'int'.</p> <p>So, change what you have into an object and then step through the keys with a 'for in' loop. Yes, you'll still have to check on each one to see if it hasOwnProperty (or use a jquery/underscore 'each'), but at least you'll be using the right tool for the job :) Or if you just want the count of keys, underscore.js has a nice little _.keys method.. so _.keys(obj).length would give you the number of keys. Pretty sure it's just local keys, not prototype ones..</p> <p>Edit: as a re-read and hopefully better to the point answer, there is no property in JS that I'm aware of where you can simply get a count of the keys. If it was just a particular thing you were working with and not 'all object's, you could do something like..</p> <pre><code>var specialObject = function () {this.keys = 0;}; specialObject.prototype.set = function (key, val) { if(!this[key]) { this.keys++; } this[key] = val; }; var so = new specialObject(); so.set('test', 'blah'); so.keys //would be 1 so.test //would be 'blah' </code></pre> <p>and then just always use 'set'. You'd want to make an 'unset' and possibly a 'get' method as well.</p> <p>Hopefully this all makes sense.. it's a bit rambly.</p>
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