mootools « object « Javascript Data Type Q&A

1. accessing variables and methods of parent javascript object?    stackoverflow.com

var SortingTable = new Class({
          initialize: function( table, options ) {
            ...

2. MooTools: How to tell if object is array?    stackoverflow.com

Is there a shortcut in MooTools for telling if an object is an object or an array?

3. Convert json object to json string and use it's functions?    stackoverflow.com

I have a json object with a function:

var thread = {
    title: "my title",
    delete: function() {
        alert("deleted");
 ...

4. JavaScript, MooTools - Variable scope in Class/overwrite global variable    stackoverflow.com

Can somebody explain me, why I am able to overwrite a method value of a global instance by just setting its value locally and why I am not able to do ...