Add to Underscore.js the ability to get a nested object property via a path string.

helpers.js

_.mixin({
	/**
	 * getNestedObjectPropertyByPath
	 *
	 * Helps in accessing a nested object property via a path string
	 * See http://stackoverflow.com/a/6491621/679369
	 *
	 * @param {object} o An object
	 * @param {string} s A string representing the key of a property to return
	 * @return {*} The property of o represented by s
	 */
	getNestedObjectPropertyByPath: function (o, s) {
		s = s.replace(/\[(\w+)\]/g, '.$1');
		s = s.replace(/^\./, '');
		var a = s.split('.');

		while (a.length) {
			var n = a.shift();
			if (n in o) {
				o = o[n];
			} else {
				return;
			}
		}

		return o;
	}
});