A closure containing a pure function in js

pure_function_within_a_closure.js

/*
  Functions containing no free/unbound variables are called pure functions.
  Functions containing one or more free variables are called closures.

  Adapted from the quick exercise in https://leanpub.com/javascript-allonge/read#closures

  If pure functions can contain closures, can a closure contain a pure function? 
  Attempt to compose a closure that contains a pure function.
  
  Many thanks to @raganwald!
*/

(
  function (x) {
    return function (y) {
      (function (n) {
        return n;
      });
      return x;
    };
  }
)("foo")("bar");
  //=> 'foo'

@raganwald What do you think about this as an example of pure functions contained in closures? :)