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Quine: Difference between revisions
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A '''[[wikipedia:quine|quine]]''' is a program which takes no input and produces a copy of its own source code as its only output. | A '''[[wikipedia:quine|quine]]''' is a program which takes no input and produces a copy of its own source code as its only output. | ||
== Traditional expression == | |||
In APL, a quine is listed in the [[FinnAPL idiom library]] as "an expression giving itself": | In APL, a quine is listed in the [[FinnAPL idiom library]] as "an expression giving itself": | ||
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1⌽22⍴11⍴'''1⌽22⍴11⍴''' | 1⌽22⍴11⍴'''1⌽22⍴11⍴''' | ||
</source> | </source> | ||
=== Modern update === | |||
In 2019, [[Nick Nikolov]] proposed to shorten it using the [[commute]] operator:<ref>[https://chat.stackexchange.com/transcript/message/48380903#48380903 Transcript for 2019-01-06] – [[APL Orchard]].</ref> | In 2019, [[Nick Nikolov]] proposed to shorten it using the [[commute]] operator:<ref>[https://chat.stackexchange.com/transcript/message/48380903#48380903 Transcript for 2019-01-06] – [[APL Orchard]].</ref> | ||
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</source> | </source> | ||
Explanation:<ref>[https://codegolf.stackexchange.com/a/178459/87954 Golf you a quine for great good! – APL (Dyalog Unicode), 18 bytes] – Code Golf Stack Exchange.</ref> | ==== Explanation ==== | ||
This shorter version is explain as follows:<ref>[https://codegolf.stackexchange.com/a/178459/87954 Golf you a quine for great good! – APL (Dyalog Unicode), 18 bytes] – Code Golf Stack Exchange.</ref> | |||
* <source lang=apl inline>'''1⌽,⍨9⍴'''</source> the characters <source lang=text inline>'1⌽,⍨9⍴'</source> | * <source lang=apl inline>'''1⌽,⍨9⍴'''</source> the characters <source lang=text inline>'1⌽,⍨9⍴'</source> | ||
* <source lang=apl inline>9⍴</source> reshape to shape 9, resulting in <source lang=text inline>'1⌽,⍨9⍴''</source> | * <source lang=apl inline>9⍴</source> reshape to shape 9, resulting in <source lang=text inline>'1⌽,⍨9⍴''</source> | ||