JS - Namespace

To make namespace, do like

var lucia = lucia || {};

Then you can do

lucia.name = 'New York';

lucia.say = function(){

    alert('Okey');

}

More details:
<script>
var lucia = function(){
    return {
        methodA: function(){
            alert('Method A');
        },
        methodB: function(){
            alert('Method B');
        }
    }
};

var a = new lucia();
a.methodB()
a.methodA()

</script>

For private member:
<script>
    var lucia = function(){

    var name = 'Lucia Namespace';

    function say(){

        return name;

    }
    return {
        methodA: function(){
            alert('Method A');
        },
        methodB: function(){
            alert('Method B');
        }
    }
};

var a = new lucia();
a.methodB()
a.methodA()

</script>

JS - Namespace