Obligatory Quine Challenge
Rules
Using your language of choice, golf a quine.
A quine is a non-empty computer program which takes no input and produces a copy of its own source code as its only output.
No cheating -- that means that you can't just read the source file and print it. Also, in many languages, an empty file is also a quine: that isn't considered a legit quine either.
Additionally, your quine may not consist of only one data section. This includes HTML programs without tags (thus only printing their source), and the Golfscript program 1.
Scoring
The shortest program in bytes wins. Trailing newlines must be counted if your program outputs one.
Vyxal/Keg , 8 bytes `:. …
7mo ago
BQN, 20 bytesSBCS ``` ∾2/0‿8 …
~2mo ago
[Husk], 8 bytes S+s"S+s …
7mo ago
Scala 3, 80 bytes ```lang-sca …
~2mo ago
Jq, -rn 18 bytes ``` "|@js …
2mo ago
BQN, 14 bytesSBCS ``` ∾⟜•FMT …
~2mo ago
6 answers
BQN, 20 bytesSBCS
∾2/0‿8⊏↓"∾2/0‿8⊏↓"""
BQN's strings escape double quotes by doubling them, so that the string used to start with only contains a single quote, although the output needs to have four quote characters. This also means that the source string is displayed with lots of quotes in the REPL.
∾2/0‿8⊏↓"∾2/0‿8⊏↓"""
"∾2/0‿8⊏↓""" # Source for the function, followed by a quote
↓ # All suffixes
0‿8⊏ # Suffixes 0 and 8: all, and the last character
2/ # Copy each twice
∾ # Join it together
Documentation: Suffixes and Join.
0 comments
Husk, 8 bytes
S+s"S+s"
Basically Leo's original quine.
It concatenates the string evaluated version of S+s to itself.
So: "S+s" + "\"S+s\"" gives the original code.
0 comments
Scala 3, 80 bytes
@main def m={val s="@main def m={val s=%c%s%1$c;printf(s,34,s)}";printf(s,34,s)}
The printf replaces %c and %1$c in string s with the quote character (34 in decimal), and replaces %s with the contents of s.
0 comments
5 comments
Might wanna change the name to something better, just sayin' — Razetime 7 months ago
"that means that you can't just read the source file and print it" Does JavaScript "toString()" count as reading the source file? — Moshi 7 months ago
I posted a PHP simplistic answer that was rejected based on a reference to SE rules. Can we get those rules (a) at a minimum linked inside this question (the only link is to a Wikipedia definition, which since Wikipedia can change beyond our control is not definitive) and (b) preferably spell out all the rules somewhere on Codidact (Meta to start, eventually a Help/FAQ page). And if that info. is already on Codidact, include a link here. — manassehkatz 7 months ago
I've asked a meta question regarding whether or not we should import the FAQ questions from SE, which includes a comprehensive definition of a valid quine. — Lyxal 7 months ago
I was also thinking of reposting the quine question, but you beat me to it. One thing that I was thinking of changing was to allow function submissions, which would let some answers be somewhat distinct from the old question. — Jo King 7 months ago