Arc - Programming language

#513on PLDB

23Years Old

236Repos

Arc is a dialect of the Lisp programming language developed by Paul Graham and Robert Morris.. Read more on Wikipedia...

Tags: programming language, lisp
There are at least 236 Arc repos on GitHub
The Google BigQuery Public Dataset GitHub snapshot shows 417 users using Arc in 467 repos on GitHub
Explore Arc snippets on Rosetta Code
Arc on HOPL
Arc appears in the TIOBE Index
See also: (21 related languages) Lisp, Racket, S-expressions, Scheme, JavaScript, Java, C, Interlisp, Lisp Machine Lisp, Common Lisp, T, Emacs Lisp, AutoLISP, ISLISP, OpenLisp, PicoLisp, EuLisp, NewLisp, Clojure, LFE, Bel
1 PLDB concepts link to Arc: Bel

Example from hello-world:

(prn "Hello World")

Example from Wikipedia:

(defop said req
  (aform [onlink "click here" (pr "you said: " (arg _ "foo"))]
    (input "foo")
    (submit)))

Language features

Feature	Supported	Example	Token
Strings	✓	"Hello world"	"
Macros	✓	; http://www.arclanguage.org/tut.txt ; We know enough now to start writing macros. Macros are basically ; functions that generate code. Of course, generating code is easy; ; just call list. ; ; arc> (list '+ 1 2) ; (+ 1 2) ; ; What macros offer is a way of getting code generated this way into ; your programs. Here's a (rather stupid) macro definition: ; ; arc> (mac foo () ; (list '+ 1 2)) ; *** redefining foo ; #3(tagged mac #) ; ; Notice that a macro definition looks exactly like a function ; definition, but with def replaced by mac. ; ; What this macro says is that whenever the expression (foo) occurs ; in your code, it shouldn't be evaluated in the normal way like a ; function call. Instead it should be replaced by the result of ; evaluating the body of the macro definition, (list '+ 1 2). ; This is called the "expansion" of the macro call.
Print() Debugging	✓		prn