RC Code Golf

Follow me for code golf challenges by the @RecurseCenter. Answers must fit in a tweet. Confused? See:

[RC Code Golf @ConciseCode]

Write a novel and useful command line utility.

[rntz @arntzenius]

@ConciseCode
% brute-force prolog
sort(I,O) :- permutation(I,O), sorted(O).
sorted([]).
sorted([_]).
sorted([X,Y|T]) :- X<Y, sorted([Y|T]).

[Stefanie Schirmer @linse]

@ConciseCode
import Data.List
f::Ord a=>[a]->[a]
f=foldr insert[]

[rntz @arntzenius]

@ConciseCode
while read n; do
((++i))
sleep $n && echo $n &
done
for _ in `seq 0 $i`; do
wait
done

sleep sort, in bash!

[RC Code Golf @ConciseCode]

Sort a list, without using your language's built-in sort function. (Thanks to @arntzenius for the suggestion!)

[rntz @arntzenius]

@ConciseCode ((λ (x) `(,x ',x)) '(λ (x) `(,x ',x)))

[Steeeve @ifosteve]

@ConciseCode yay go quines!
package main;import.`fmt`;func main(){s:="package main;import.`fmt`;func main(){s:=%q;Printf(s,s)}";Printf(s,s)}

[Jeff @jeffowler]

@ConciseCode oh here's an even better rb:

p %x<cat #{$0}>

[Jeff @jeffowler]

@ConciseCode oooh I've got a good one for this from php land

<?system("cat ".$argv[0]);

@rasmus ?

[RC Code Golf @ConciseCode]

Write a quine. (A quine is a program that takes no input and outputs its own source. See: https://t.co/G6diF4yyc2.)

[Jeff @jeffowler]

@ConciseCode curl https://t.co/1BTShb1eK2 | sed -n '722p' | cut -c'114-258' | sed s/\&\#39\;/\'/g

[Eric @robotdharma]

@ConciseCode (re-seq #""(.*)"" (nth (re-seq #"<title>.*<\/title>" (slurp "https://t.co/k6yueCizgT")) 0)) #sloppyClojure

[heartpunk @heartpunkk]

@ConciseCode curl $1|grep -m1 t-te|perl -pe's/<.+?>//g'

[m reina @_mO_reina]

@ConciseCode (let ((x (drakma:http-request "https://t.co/nKhrDokgpB")))
(subseq x (+ (search "e>" x) 2) (search "</ti" x))) #lisp

[RC Code Golf @ConciseCode]

@andy_kelley We see what you did there.

[RC Code Golf @ConciseCode]

@ConciseCode Note also that you only have 127 (not 140!) characters because you need to tweet at us!

[RC Code Golf @ConciseCode]

Write a program that takes a tweet URL (e.g., https://t.co/fnHMDU3hMM) and prints the tweet. (NB: We haven't tried to do this in 127 chars!)

[Recurse Center @recursecenter]

A fun and/or terrifying thing to this weekend: Find the oldest code you've written, and think about how you'd write it differently today.

[RC Code Golf @ConciseCode]

Hello, world! Follow me for code golf challenges by the @RecurseCenter. Answers must fit in a tweet. Confused? See: https://t.co/Zv1RI5DBGz