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Quine: Difference between revisions
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Text replacement - "</source>" to "</syntaxhighlight>"
m (Text replacement - "<source" to "<syntaxhighlight") |
m (Text replacement - "</source>" to "</syntaxhighlight>") |
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| Line 6: | Line 6: | ||
<syntaxhighlight lang=apl> | <syntaxhighlight lang=apl> | ||
1⌽22⍴11⍴'''1⌽22⍴11⍴''' | 1⌽22⍴11⍴'''1⌽22⍴11⍴''' | ||
</ | </syntaxhighlight> | ||
=== Modern update === | === Modern update === | ||
| Line 13: | Line 13: | ||
<syntaxhighlight lang=apl> | <syntaxhighlight lang=apl> | ||
1⌽,⍨9⍴'''1⌽,⍨9⍴''' | 1⌽,⍨9⍴'''1⌽,⍨9⍴''' | ||
</ | </syntaxhighlight> | ||
==== Explanation ==== | ==== 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> | 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> | ||
* <syntaxhighlight lang=apl inline>'''1⌽,⍨9⍴'''</ | * <syntaxhighlight lang=apl inline>'''1⌽,⍨9⍴'''</syntaxhighlight> the characters <syntaxhighlight lang=text inline>'1⌽,⍨9⍴'</syntaxhighlight> | ||
* <syntaxhighlight lang=apl inline>9⍴</ | * <syntaxhighlight lang=apl inline>9⍴</syntaxhighlight> reshape to shape 9, resulting in <syntaxhighlight lang=text inline>'1⌽,⍨9⍴''</syntaxhighlight> | ||
* <syntaxhighlight lang=apl inline>,⍨</ | * <syntaxhighlight lang=apl inline>,⍨</syntaxhighlight> concatenate with itself, resulting in <syntaxhighlight lang=text inline>'1⌽,⍨9⍴'''1⌽,⍨9⍴''</syntaxhighlight> | ||
* <syntaxhighlight lang=apl inline>1⌽</ | * <syntaxhighlight lang=apl inline>1⌽</syntaxhighlight> rotate one character to the left, getting the characters: <syntaxhighlight lang=text inline>1⌽,⍨9⍴'''1⌽,⍨9⍴'''</syntaxhighlight> | ||
== Further Entries == | == Further Entries == | ||
| Line 27: | Line 27: | ||
<syntaxhighlight lang=apl> | <syntaxhighlight lang=apl> | ||
'{∊⍵⍺⍵⍺,4/⍵}'{∊⍵⍺⍵⍺,4/⍵}'''' | '{∊⍵⍺⍵⍺,4/⍵}'{∊⍵⍺⍵⍺,4/⍵}'''' | ||
</ | </syntaxhighlight> | ||
==== Explanation ==== | ==== Explanation ==== | ||
In this code, the main function is <syntaxhighlight lang=apl inline>{∊⍵⍺⍵⍺,4/⍵}</ | In this code, the main function is <syntaxhighlight lang=apl inline>{∊⍵⍺⍵⍺,4/⍵}</syntaxhighlight> with the right argument <syntaxhighlight lang=apl inline>⍵</syntaxhighlight> being single quote literal (spelled with four quotes, <syntaxhighlight lang=apl inline>''''</syntaxhighlight>, because single quotes delimit APL character literals, and quotes inside such must be doubled), and the left argument <syntaxhighlight lang=apl inline>⍺</syntaxhighlight> being the character vector representation of the function (<syntaxhighlight lang=apl inline>'{∊⍵⍺⍵⍺,4/⍵}'</syntaxhighlight>). | ||
The idea behind this quine is that the only thing you need to have a string containing the original code is to reproduce this structure: [quote] [function] [quote] [function] [quote] [quote] [quote] [quote]. This is precisely what the function does. Given the representation of a function <syntaxhighlight lang=apl inline>⍺</ | The idea behind this quine is that the only thing you need to have a string containing the original code is to reproduce this structure: [quote] [function] [quote] [function] [quote] [quote] [quote] [quote]. This is precisely what the function does. Given the representation of a function <syntaxhighlight lang=apl inline>⍺</syntaxhighlight> (itself in this case), and character <syntaxhighlight lang=apl inline>⍵</syntaxhighlight> (here, the quote), it produces the structure <syntaxhighlight lang=apl inline>⍵ ⍺ ⍵ ⍺ ⍵ ⍵ ⍵ ⍵</syntaxhighlight>. A more explicit version would be <syntaxhighlight lang=apl inline>'{⍵,⍺,⍵,⍺,⍵,⍵,⍵,⍵}'{⍵,⍺,⍵,⍺,⍵,⍵,⍵,⍵}''''</syntaxhighlight> which simply concatenates together the required parts. The original quine is very similar, only using the shorter <syntaxhighlight lang=apl inline>4/⍵</syntaxhighlight> to produce the 4 occurrences of <syntaxhighlight lang=apl inline>⍵</syntaxhighlight>, and [[code golf|golfs]] away the spaces, instead opting for [[Enlist]] (<syntaxhighlight lang=apl inline>∊</syntaxhighlight>) to flatten the intermediary [[nested array]]. | ||
=== Based on code point of quote === | === Based on code point of quote === | ||
| Line 38: | Line 38: | ||
<syntaxhighlight lang=apl> | <syntaxhighlight lang=apl> | ||
{,⍨⍵,⎕UCS 39}'{,⍨⍵,⎕UCS 39}' | {,⍨⍵,⎕UCS 39}'{,⍨⍵,⎕UCS 39}' | ||
</ | </syntaxhighlight> | ||
==== Explanation ==== | ==== Explanation ==== | ||
In this code, the main function is <syntaxhighlight lang=apl inline>{,⍨⍵,⎕UCS 39}</ | In this code, the main function is <syntaxhighlight lang=apl inline>{,⍨⍵,⎕UCS 39}</syntaxhighlight> with the argument <syntaxhighlight lang=apl inline>⍵</syntaxhighlight> being the function itself which avoids duplication of quotes by generating the quote from its [[Universal Character Set]] code point (<syntaxhighlight lang=apl inline>⎕UCS</syntaxhighlight>). | ||
The idea behind this quine is that the only thing you need to have a string containing the original code is to reproduce this structure: [function] [quote] [function] [quote]. This is precisely what the function does. Given the representation of a function <syntaxhighlight lang=apl inline>⍵</ | The idea behind this quine is that the only thing you need to have a string containing the original code is to reproduce this structure: [function] [quote] [function] [quote]. This is precisely what the function does. Given the representation of a function <syntaxhighlight lang=apl inline>⍵</syntaxhighlight> (itself in this case), it generates a quote and concatenates it on the right of the function definition, giving [function] [quote]. It then uses [[commute|self]]-[[catenate|concatenation]] (<syntaxhighlight lang=apl inline>,⍨</syntaxhighlight>) to repeat the two parts into the required four. | ||
== External links == | == External links == | ||