Question

How do I construct a new instance of a defined object?

I have code similar to this but the this.User = new User(); it doesn’t work.

(function () {

SomeApp = {

    User: {
        FirstName: '',
        LastName: ''

    },

    Users: [],

    init: function () {
        this.User.FirstName = 'Joe';
        this.User.LastName = 'Blogs';

        //add user to list
        var copiedUser = {};
        $.extend(copiedUser, this.User);
        this.Users.push(copiedUser);

        //create new user
        this.User = new User();
        this.User.FirstName = 'Jane';

        //add user to list
        var copiedUser = {};
        $.extend(copiedUser, this.User);
        this.Users.push(copiedUser);
    }
}

SomeApp.init();

})();

Answer 1

If you want to be able to create object using new, you may create a “constructor” :

function User() {
    this.FirstName = '';
    this.LastName = '';
}

Side note : I’d recommend you to follow best practices in naming variables. Please read this guide.