Object.prototye.getValue

getValue

/*
 * Gets the value of the object by using the keys passed as string.
 * Returns the value of the specified key, null if undefined.
 */
if (!Object.prototype.getValue) {
	Object.prototype.getValue = function (key) {
		var self = this;

		if (!(self instanceof Object) || Object.keys(self).length == 0 || !key || typeof key !== 'string') {
			return self;
		}

		if (key.indexOf('.') != -1) {
			var subKey = key.substr(0, key.indexOf('.'));
			if (self[subKey]) {
				return self[subKey].getValue(key.substr(key.indexOf('.') + 1))
			}
		} else {
			return self[key];
		}
	}
}

Usage Example :

var x = {
	a: {
		b: {
			c: {
				d: "ABC"
			},
			e: "ABC"
		},
		f: "AB"
	},
	g: "A"
};

x.getValue('a.b.c');

// returns {d: "ABC"}