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Haskell + hgl, 10 bytes mpn$ce~<gj Attempt This Online! Explanation mpn map across all non-empty prefixes of the input ... ce count the number of elements in each prefix equal to ... g...
Respect both sides We should consider how an approach would affect the poster of the incorrect answer, and how it would affect the posters of correct answers. Correct answers In general, allowin...
Dyalog APL, 23 bytes {⍵+(⌈/+⌊/)10⊥⍣¯1⊢⍵}⍣⎕⊢1...
R, 32 bytes \(s)intToUtf8(rev(utf8ToInt(s))) Attempt This Online!
Brainfuck, 10 Bytes ,[>,]<[.<] Requires EOF to be 0. Try it online! ,[>,]<[.<] , # Read character [ ] # loop as long as current cell is not 0 (EOF) >, ...
A program may use IOs for input and output. A input can be read via IO, which can be a port with (multiple) IOs each IO reads a symbol (a bit or more when you have a ADC). Or it can come from fram...
Python, 143 bytes def r(i): y,z=65537,1+(1<<32);s=257*y*z;n=(i|(i&252*s)*y>>10|(i&254*s)*z>>17|(i&127*s)*z>>15|(i&63*s)*y>>6)&(1<<64)-1 ...
Libraries are removed when "merge variants" is on. For example, this answer written in C (clang) uses a library called BMPL, so its header is C (clang) + BMPL. While there's nothing wrong with usin...
Ruby, 75 bytes ->t,u{g=->a{a.reduce{-2*_1+_2}};('%b'%(g[t]+g[u]+(y=43690)^y)).to_i.digits} Try it online! Uses latest ruby features, so tio link will look different. Takes two digit a...
JavaScript, 26 bytes Outputs the nth term, 0-indexed. f=n=>n<2?n:f(--n)*2+f(--n) Try it online! JavaScript, 49 bytes Outputs the first n terms as a comma delimited string. f=n=>...
Charcoal, 13 bytes Hello, World! Try it online! I'm surprised no one even used Charcoal in the challenge. Guess I'll take it.
!@#$%^&*()_+, 17 bytes ^dlroW ,olleH(@) Try it online! Might learn this sometime but I found this.
Lean, 64 bytes def hello_world:io unit:=put_str"Hello, World!"#eval hello_world Try it online!
Japt, cracked by Shaggy, 17 bytes "Cops and Robbers Try it online! Don't think much recognize this language at all. This is supposed to be from Pyth, but Japt has this too, so it's certainly v...
Forget, 319 bytes push 72;cleanse;pop;out;push 101;cleanse;pop;out;push 108;cleanse;pop;out;push 108;cleanse;pop;out;push 111;cleanse;pop;out;push 44;cleanse;pop;out;push 32;cleanse;pop;out;push 8...