How can “new new Something” produce valid results in JavaScript?

Question

I\'m currently developing a JavaScript parser and study the ECMAScript 5.1 specification. Here\'s a question which puzzles me at the moment.

§ 11.2 Left-Hand

Answer 1

It is not common at all, but it is possible; a function that returns a function:

function baz(){}
function foo(){return baz}

new new foo() instanceof baz // true