Bro, do you even?

brototype.js

if (Object.defineProperty) {
	Object.defineProperty(Object.prototype, 'doYouEven', {
		value: function(key) {
		    var props = (key || '').split('.'),
			item = this;
		    for (var i=0; i<props.length; i++) {
		        item = item[props[i]];
		        if (typeof item === 'undefined') return false;
		    }
		    return true;
		},
		writable: false,
		configurable: false,
		enumerable: false
	});


	var bro = {};
	bro.doYouEven('lift'); // returns false

	bro.lift = function() { console.log('yo!'); }
	bro.doYouEven('lift'); // returns true

	bro.foo = { bar: false };
	bro.doYouEven('foo.bar'); // returns true
}