propertyValue: Gets a value from deep/nested objects

gistfile1.js

var propertyValue = function(obj, key, separator = '.') {
	var keyArray = key.split(separator);
	var result = obj;
	
	for (var i = 0, j = keyArray.length; i < j; i++) {
		(function(name) {
			result = result[name];
		})(keyArray[i]);
	}
	
	return result;
};