🐼 Lisp programming, why not?
Install Lisp on MacOSX
If you do not have home brew, you can install it from:

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

then type:

brew -v install clisp

After install it, you can confirm the clisp installation by typing clisp in Command Line
and you should see something reasonable. Otherwise you need to figure out the issue.

you are in an READ-EVAL-PRINT window and it can evaluate lisp commands/functions, e.g. evaluate 1 + 2
>(+ 1 2) ; 3
Run Lisp in Command Line
I just found out Lisp is very interesting programming language, it is more "elegant" than Haskell.
The best way to know more about it is to learn it. I think Haskell use many "good" stuff from Lisp 
if I understand correctly.

create file called mylisp.lisp
and add follow code to it:
(+ 1 2)

In Command Line type:
>clisp mylisp.lisp

This is your first lisp code:)