String() constructor

The String constructor is used to create a new String object. When called instead as a function, it performs type conversion to a primitive string, which is usually more useful.

thing

Anything to be converted to a string.

String function and String constructor produce different results:

typeof String('Hello world'); // string
typeof new String('Hello world'); // object

Here, the function produces a string (the primitive type) as promised. However, the constructor produces an instance of the type String (an object wrapper) and that's why you rarely want to use the String constructor at all.

• Text formatting in the JavaScript Guide