Different factory patterns

gistfile1.js

function ObjectFactory () {
    this.build = {
        chocolate: function () {
            console.log('built a chocolate factory');
        },
        fudge: function () {
            console.log('built a fudge factory');    
        }
    }
}

function SwitchCaseFactory () {
    this.build = function (type) {
        var factory;
        switch (type) {
            case 'chocolate': 
                factory = function () {
                    console.log('built a chocolate factory');
                };
                break;
            case 'fudge': 
                factory = function () {
                    console.log('built a fudge factory');    
                };
                break;
        }
        return factory()
    }
}

var objectFactory = new ObjectFactory();
objectFactory.build.chocolate();

var switchCaseFactory = new SwitchCaseFactory();
switchCaseFactory.build('fudge');

function Chocolate () {
    console.log('built a chocolate object');
}

function Fudge () {
    console.log('built a fudge object');
}

function SweetFactory () {
    function classFor (type) {
        switch (type) {
            case 'chocolate': 
                return Chocolate;
            case 'fudge': 
                return Fudge;        
        }
    }
    this.build = function (type) {
        var Sweet = classFor(type);
        return new Sweet();
    }
}

var sweetFactory = new SweetFactory();
sweetFactory.build('chocolate');