Knuth shuffle: Difference between revisions
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=={{header|Joy}}== |
=={{header|Joy}}== |
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< |
<syntaxhighlight lang=Joy>DEFINE knuth-shuffle == |
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(* Take the size of the array (without destroying it) *) |
(* Take the size of the array (without destroying it) *) |
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dup dup size |
dup dup size |
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(* Generate a list of as many random numbers *) |
(* Generate a list of as many random numbers *) |
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[rand] [rem] enconcat map |
[rand] [rem] enconcat map |
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(* Zip the two lists *) |
(* Zip the two lists *) |
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swap zip |
swap zip |
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(* Sort according to the new index number *) |
(* Sort according to the new index number *) |
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[small] [] [uncons unswonsd [first >] split [swons] dip2] |
[small] [] [uncons unswonsd [first >] split [swons] dip2] |
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[enconcat] binrec |
[enconcat] binrec |
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(* Delete the new index number *) |
(* Delete the new index number *) |
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[second] map.</ |
[second] map.</syntaxhighlight> |
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Using knuth-shuffle (file shuffle.joy): |
Using knuth-shuffle (file shuffle.joy): |
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<syntaxhighlight lang=Joy>(* Sorted array of 21 integers *) |
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[ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20] |
[ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20] |
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knuth-shuffle.</ |
knuth-shuffle.</syntaxhighlight> |
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Command line: |
Command line: |
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: <tt>joy shuffle.joy</tt> |
: <tt>joy shuffle.joy</tt> |
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