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Re: A little golfing challenge: replace digits by random letters

by BrowserUk (Patriarch)
on Feb 10, 2019 at 11:24 UTC ( #1229705=note: print w/replies, xml ) Need Help??


in reply to A little golfing challenge: replace digits by random letters

Not a perfect shuffle, but close (enough?) and much shorter:

perl -M5';$x=join"",sort{rand()<rand}a..z' -pe 'eval"tr/0-9/$x/"' input.txt

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Re^2: A little golfing challenge: replace digits by random letters
by bliako (Monsignor) on Feb 10, 2019 at 13:02 UTC

    half-blind-sort is a great idea (and so is {rand()<rand} ).

    Couldn't resist sort{rand(2)-1} as it's shorter by 2 and truer blind.

    Update/Correction: as vr rightly notes, int(rand(2)-1) is constantly 0!!! Because sort expects an integer back from the comparison BLOCK and int()'ing rand(2)-1 leaves just 0 :(. So, both these compensate for that bug and are uniformly random too: sort{rand(6)-4} and sort{1-rand(3)%3}

      Perhaps sort{rand(2)-1} (in effect, same as sort{0}) is somewhat too deterministic :). But

      $ perl -E 'say sort{rand 2}a..z'

      produces random enough strings, and is shorter.

        ai! indeed it is. got bitten by int. This is uniformly random sort{rand(6)-4} and so is this sort{1-rand(3)%3}

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