One of the nice things about Lisp is that you can color the parentheses pink, which looks pretty:
; simple iterator (= f (co (let x 0 (while t (yield (++ x)))))) (f) ;returns 1 (f) ;returns 2 (f) ;returns 3
;passing yield into a tree-traversal function (= f (co (co:treewise (fn (a b)) ;empty function given as the join function yield ;yield given as the leaf function '(a . ((b . c) . d))))) (f) ;returns 'a (f) ;returns 'b (f) ;returns 'c (f) ;returns 'd (f) ;returns nil
;passing values into the coroutine (= x 1) (= f (co (while t (if (= in (yield x)) ;if the call supplied an argument (do (= x in) ;reassign x and print message (prn (string "you gave me: " x))))))) (f) ;returns 1 (f) ;returns 1 (f 0) ;prints "you gave me: 0" and returns 0 (f) ;returns 0 (f) ;returns 0 (f 'hello) ;prints "you gave me: hello" and returns 'hello (f) ;returns 'hello
(mac co body (w/uniq (con1 con2 argl) `(withs (,con1 nil ,con2 nil yield (fn ((o val nil)) (ccc [do (= ,con2 _) (,con1 val)]))) (def ,con2 ,argl ;(while t ;make generation cyclic ,@body ;) (def ,con2 args nil) (,con1 nil)) (fn args (ccc [do (= ,con1 _) (apply ,con2 (or args (list nil)))])) )))
Speaking of pink, just the other day I saw this awesome Hello Kitty folder at Target, and even though she didn't ask, I let the cashier know that I was buying it for myself. That's how secure I am in my manliness.
On a serious note, the design of Arc is very pretty on many levels. My own language that I'm currently designing has a similar kind of aesthetic, although it's a completely different language.