Where to declare class constants?

Question

I\'m using class members to hold constants. E.g.:

function Foo() {
}

Foo.CONSTANT1 = 1;
Foo.CONSTANT2 = 2;

This works fine, except that it see

Answer 1

Also with namespaces

var Constants = {
    Const1: function () {
        Const1.prototype.CONSTANT1 = 1;
        Const1.prototype.CONSTANT2 = 2;
    },

    Const2: function () {
        Const2.prototype.CONSTANT3 = 4;
        Const2.prototype.CONSTANT4 = 3;
    }
};

Answer 2

If you're using jQuery, you can use $.extend function to categorize everything.

var MyClass = $.extend(function() {
        $.extend(this, {
            parameter: 'param',
            func: function() {
                console.log(this.parameter);
            }
        });
        // some code to do at construction time
    }, {
        CONST: 'const'
    }
);
var a = new MyClass();
var b = new MyClass();
b.parameter = MyClass.CONST;
a.func();       // console: param
b.func();       // console: const

Answer 3

what you are doing is fine (assuming you realize that your example is just setting the same property twice); it is the equivalent of a static variable in Java (as close as you can get, at least without doing a lot of work). Also, its not entirely global, since its on the constructor function, it is effectively namespaced to your 'class'.