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Haskell, 66 bytes -7 bytes thanks to Razetime import Data.Complex (\c->(<2).magnitude$(iterate(\z->z*z+c)c)!!16) I use the fact, that if the result is bigger than 2, it will be fore...
DC is a reverse-Polish calculator REPL that is available on most Linux distributions. In reverse-Polish notation, you can push values to a stack and then pop those values back off to perform operat...
A King of the Hill contest requires that a controller program provided by the person hosting the contest communicate (both input and output) with each of the entries to the contest. For some contes...
Start afresh but keep history When migrating to the Challenges category, there are several aspects of the post that could be included or discarded: Comments Edit history Votes Comments Th...
Bash + a ton of non-standard packages that were already installed on my machine, non-competing 83 bytes tabs #bash: set tabs on a terminal cd #bash: change directory efibootmgr #linux: modify th...
Rockstar, 76 bytes Takes individual integers as input. listen to f let n be f o's1 while n let o be o and n is f listen to n say o Try it (Code and input will need to be added manually...
Ruby, 17 bytes ->{_2.reduce(_1)} Takes function (Proc) followed by Array. 32 bytes without inject or reduce ->f,(a,*r){r.map{|n|a=f[a,n]};a}
Haskell, 18 bytes n!g=foldl1 g[1..n] Try it online!
Japt, 610 606 bytes Don't think there's anything more that can be done with it than this. 933î`'T°s ߦg, d e sÒy v Did gy d g½e e °¼; A¥ Úßy ØÀ e Þgov, A e Ú ÎÈs tg¼.0"BeØ ...
In this request (not really a feature-request but still tagged so anyway), I'd like to have detailed wikis on tags and maybe usage information on them too. Currently, these tags have usage info in...
Python 3, 20 bytes lambda l:len({*l})<2 Try it online!
Haskell, 16 bytes f(a:b)=all(==a)b Try it online!
Haskell, 110 bytes f a=s>>=(#)$a++reverse a c@(a:b)!f=f c:b!f _!_=[] f#n=n!((n!).f) s(p:q)(d:e)(b:c)|e==c||e==[]=b|q==c=d|0<1=' ' Try it online!
V (vim), 23 bytes æw|PòlÄxòjVLkîyllv$r $Ð Try it online! Hexdump: 00000000: e677 7c50 f26c c478 f26a 564c 6bee 796c .w|P.l.x.jVLk.yl 00000010: 6c76 2472 2024 d0 lv$r ...
Currently, the only purpose a link to a SE account serves is to associate imported content with your CD account. Since Code Golf doesn't have any imported content from SE, there's no option to link...
Scala, 9 bytes _.reverse Try it in Scastie! Explanation: _.reverse _ //The function argument . //Call a method reverse //Reverse the string
Scala, 99 bytes s=>{val x=s+s.reverse s(0)+"\n"+x.tail.init.zipWithIndex.map{case(c,i)=>c+" "*i+c+"\n"}.mkString+x} Try it in Scastie!
PowerShell, 43 bytes param($s)(($s=$s|% t*y)|%{$s[--$q]})-join'' Try it online!
APL (Dyalog Unicode), 11 7 bytes (SBCS) Razetime and rak1507 came up with 7 byte equivalents of my original dfn (this one's rak1507's). See their solutions below. +/¨⊢=,\ Try it online! +/¨...
Exploiting layout Make it thin Newlines and indentation are expensive, so remove them when possible. Some examples: &v factorial v< > >:1-:| v* < >$>\:| ...
Jq, -rn 18 bytes "|@json+."|@json+. "|@json+." # the string | # through the filter @json # json encoded + # concatenated with ...
Japt, 14 11 8 bytes £¯YÄ è¥X Try it -3 bytes thanks to @Shaggy
Scala 3, 80 bytes @main def m={val s="@main def m={val s=%c%s%1$c;printf(s,34,s)}";printf(s,34,s)} Try it in Scastie! The printf replaces %c and %1$c in string s with the quote character (34 i...
