PROGRAMMING CHALLENGE

This one should be difficult enough for you guys,

Write a function foo that takes a number n and returns a function that takes a number i, and returns n incremented by i.


My submission, in Scheme


(define (foo num)
  (lambda (x) (+ x num)))

perl:
sub foo{eval"sub{@_+pop}"}

javascript (1.8+):
foo = function(n) function(i) n + i;