Object-Oriented JavaScript

String

The String() constructor creates string objects. Primitive strings are turned into objects behind the scenes if you call a method on them as if they were objects.

Creating a string object and a string primitive:

>>> var s_obj = new String('something'); 
>>> var s_prim = 'something';
>>> typeof s_obj

"object"

>>> typeof s_prim

"string"

The object and the primitive are not equal when compared by type with ===:

>>> s_obj === s_prim

false

>>> s_obj == s_prim

true

length is a property of string objects:

>>> s_obj.length

9

If you access length on a non-object but a primitive string, the primitive is converted to an object behind the scenes and the operation is successful:

>>> "something".length

9

Members of the String Constructor

Property/Method ...