Form validation module with Promise-like interface (work in progress)

promiseFormValidity.js

var values = {
	chessIsGame : false,
	chessChampionSurname : 'Carlsen'
};

var rules = {
	chessIsGame : function(value) {
		if (value !== true) {
			return new Error("Chess IS a Game");
		}
	},
	chessChampionSurname : function(value) {
		var testValue = $.trim(value).toUpperCase();
		var chessChampSurname = 'CARLSEN';
		
		if (testValue !== chessChampSurname) {
			return new Error(chessChampSurname + " is the surname of the World Chess Champion");
		}
	}
}

processSubmission({
	values : values, 
	rules : rules
}).validate().then({
	stateValid : function(values) {
		console.log('stateValid')
	},
	stateInvalid : function(errors) {
		console.log('stateInvalid')
	}
});	

function processSubmission(options) {
	return {
		validate : function() {
			var examResults = examineValues();
			
            var state = examResults.valid ? {
                key : 'stateValid',
                content : examResults.values
            } : {
                key : 'stateInvalid',
                    content : examResults.errors
                };
	    			
    			return {
                    then : function(stateHandlers) {
                        stateHandlers[state.key](state.content);
                    }
    			}
    		}
    	}
	    	
   	function examineValues() {
   		var allValues = options.values;
	    		
		var examResults = _.reduce(_.keys(allValues), function(examResults, key) {
			var value = allValues[key];
			var result = options.rules[key](value, allValues) || value;
 
            if (result instanceof Error) {
               	examResults.errors[key] = result.message;
            }
            else {
              	examResults.values[key] = value;
            }	    					
					
			return examResults;
		}, {errors: {}, values: {}});
				
   		return _.extend({}, examResults, {
   			valid : _.isEmpty(examResults.errors)
   		});
   	}
}