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Re: Identical Arrays

by CountZero (Bishop)
on Aug 26, 2012 at 07:27 UTC ( #989800=note: print w/replies, xml ) Need Help??


in reply to Identical Arrays

Easy!
use Modern::Perl; my @one = ( 1, 2, 3 ); my @two = ( 2, 3, 1 ); my @three = ( 1, 2, 4 ); say identical( \@one, \@two ); # returns 1 say identical( \@one, \@three ); # returns 0 sub identical { my ( $first, $second ) = @_; return ((join chr(0), sort @$first) eq (join chr(0), sort @$second +)) ? 1 : 0; }
A few comments:
  • Do not use & to call your subroutines. It is not necessary and has side-effects.
  • The parameter list needs references to the arrays, otherwise the subroutine will not be able to distinguish between the two arrays.

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

My blog: Imperial Deltronics

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Re^2: Identical Arrays
by philiprbrenan (Monk) on Aug 26, 2012 at 13:26 UTC

    Not so easy!

    my @one = (chr(1), chr(1), chr(1)); my @two = (chr(1).chr(0).chr(1), chr(1)); say identical(@one, @two); # returns 1
      I know. This is one of the degenerate cases where a specially crafted string will break this simple subroutine.

      CountZero

      A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

      My blog: Imperial Deltronics

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[BarApp]: I can not use modules. I gain temporary access and still can not use modules.
[Cosmic37]: ta erix - this szabo geezer is pretty cool methinks and he writes about undef but I cannot see instructions for redefining the record separator after having undefined it
[Corion]: $/ = "wahtever";
[Corion]: (it's a magic variable)
[karlgoethebier]: BarApp: whoami
[Cosmic37]: ok fankyou - I was wondering about that but thought there might be a redefine command or something; peachy
[Lotus1]: Cosmic37 if you undef $/ in a local context to a block it won't affect the global version after the block finishes
[Lotus1]: or you can just do local $/ in a block

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