How to list the properties of a JavaScript object?

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Say I create an object
thus:

var myObject =

            {"ircEvent": "PRIVMSG", "method": "newURI", "regex":
            "^http://.*"};

What is
the best way to retrieve a list of the property names? i.e. I would like to end up with
some variable 'keys' such
that:

keys ==
            ["ircEvent", "method", "regex"]

Answer

In modern browsers (IE9+, FF4+, Chrome5+,
Opera12+, Safari5+) you can use the built in href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/keys"
rel="noreferrer">Object.keys
method:

var keys =
            Object.keys(myObject);

The
above has a full polyfill but a simplified version
is:

var getKeys =
            function(obj){
 var keys = [];
 for(var key in obj){

            keys.push(key);
 }
 return
            keys;
}

Alternatively
replace var getKeys with
Object.prototype.keys to allow you to call
.keys() on any object. Extending the prototype has some side
effects and I wouldn't recommend doing it.