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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??

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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