One is a function, one is a call to that function. I think this is just hard to grasp because in other languages there's often not occasion to use a function po

One is a function, one is a call to that function. I think this is just hard to grasp because in other languages there's often not occasion to use a function pointer. But compare these two code snippets in Python and Scheme: >>> def add_one(x): ... return x + 1 ... >>> add_one <function add_one at 0x7f7504bf2050> >>> add_one(1) 2 >>> list(map(add_one, [1,2,3])) [2, 3, 4] That's the same as: => (define (add-one x) (+ x 1)) add-one => add-one #[compound-procedure add-one] => (add-one 1) 2 1 ]=> (map add-one (list 1 2 3)) (2 3 4)