instances and default values

When you create instances of String or Number, they take the default value ("" for strings and 0 for numbers). This is not the same for Object and Array.

    var a = new Number;
    a == 0 // true

    var a = new String;
    a == "" // true

    var a = new Object;
    a == {} // false

    var a = new Array;
    a == [] // false

This is even more confusing when using the JSON-style syntax to create objects and arrays.

    var a = {};
    a == {} // false

    var a = [];
    a == [] // false

-- @remi

(Never forget: ==== - @brianleroux)