code: function stringMatch(stringValues) {
  	return function(testValue) {
  		for (var i = stringValues.length - 1; i >= 0; i--) {
  			if (stringValues[i] === testValue) {
  				return true;
  			}
  		}
  		return false;
  	};
  }
docs: Verify that a given property is one of a list of strings