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Re: Check Array Elements

by NetWallah (Canon)
on Jun 06, 2012 at 22:25 UTC ( [id://974847]=note: print w/replies, xml ) Need Help??


in reply to Check Array Elements

Look Ma ! - No temp hash! (Good if you are doing this check only a small number of times). 
if ((my $x=grep {/ABC|GHI|MNO/}@FILES) == 3){
  print qq|Found them all\n|
}else{
  print qq|found only $x\n|
}

[download]
 Update Ignore the buggy version above. Revised, based on morgons (++) observations below ..
my @need=sort qw|ABC GHI MNO|; 
my $flat=join "",@need; 
my $re="\\b" . join( "|",@need)."\\b";

if ($flat eq join( "", sort grep{m/$re/}@FILES)){
   say "Found!"
}

[download]

             I hope life isn't a big joke, because I don't get it.
                   -SNL

Replies are listed 'Best First'.
Re^2: Check Array Elements
by morgon (Priest) on Jun 06, 2012 at 22:41 UTC
    This is wrong.

    Counterexample: 

    @FILES = ("ABC", "ABC", "ABC");

    [download]
    Your grep would still report 3, event though "GHI" is missing.

    And that is even without mentioning that the regex matches also enties like "XABCY".

[reply]
[d/l]
      Thanks for pointing out the bugs (++). Code updated above.

      I think that method is getting unwieldy. Much prefer ckjs approach below.

                   I hope life isn't a big joke, because I don't get it.
                         -SNL

[reply]

        serious ++. I love seeing this type of accountability. I know I often have to swallow it.

[reply]

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