Quine: Difference between revisions
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* <source lang=apl inline>,⍨</source> concatenate with itself, resulting in <source lang=text inline>'1⌽,⍨9⍴'''1⌽,⍨9⍴''</source> | * <source lang=apl inline>,⍨</source> concatenate with itself, resulting in <source lang=text inline>'1⌽,⍨9⍴'''1⌽,⍨9⍴''</source> | ||
* <source lang=apl inline>1⌽</source> rotate one character to the left, getting the characters: <source lang=text inline>1⌽,⍨9⍴'''1⌽,⍨9⍴'''</source> | * <source lang=apl inline>1⌽</source> rotate one character to the left, getting the characters: <source lang=text inline>1⌽,⍨9⍴'''1⌽,⍨9⍴'''</source> | ||
== Further Entries == | |||
In 2022, [[APL Farm]] user oskar31415 shared the following: | |||
<source lang=apl> | |||
¯1↓1↓,⍨16⍴15⍴'''¯1↓1↓,⍨16⍴15⍴' | |||
</source> | |||
== External links == | == External links == | ||
Revision as of 18:08, 17 May 2022
A quine is a program which takes no input and produces a copy of its own source code as its only output.
In APL, a quine is listed in the FinnAPL idiom library as "an expression giving itself":
1⌽22⍴11⍴'''1⌽22⍴11⍴'''
In 2019, Nick Nikolov proposed to shorten it using the commute operator:[1]
1⌽,⍨9⍴'''1⌽,⍨9⍴'''
Explanation:[2]
'''1⌽,⍨9⍴'''the characters'1⌽,⍨9⍴'9⍴reshape to shape 9, resulting in'1⌽,⍨9⍴'',⍨concatenate with itself, resulting in'1⌽,⍨9⍴'''1⌽,⍨9⍴''1⌽rotate one character to the left, getting the characters:1⌽,⍨9⍴'''1⌽,⍨9⍴'''
Further Entries
In 2022, APL Farm user oskar31415 shared the following:
¯1↓1↓,⍨16⍴15⍴'''¯1↓1↓,⍨16⍴15⍴'
External links
- ↑ Transcript for 2019-01-06 – APL Orchard.
- ↑ Golf you a quine for great good! – APL (Dyalog Unicode), 18 bytes – Code Golf Stack Exchange.