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Re: Column Heading and Split Function

by McA (Priest)
on Mar 28, 2013 at 15:57 UTC ( #1025990=note: print w/replies, xml ) Need Help??


in reply to Title of Column and Split Function

open my $fh, "<", "filename" or die $!; my $headerline = <$fh>; unless(defined $headerline) { die "ERROR: Couldn't read header line: Bad file format?"; } while(my $line = <$fh>) { process($line); } close $fh or die $!;

McA

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[Lady_Aleena]: Why does grep(/.*$in.*/, @my_modules) work but grep { $_ =~ /.*$in.*/; $_ } @my_modules not work? What did I do wrong in the second?
[tobyink]: Why are you returning $_ n your grep block? You should return a boolean.
[tobyink]: *in your grep block
[tobyink]: You can use grep { $_ =~ /.*$in.*/; } @my_modules but why not stick to grep(/.*$in.*/, @my_modules)? (The latter is faster.)
[shmem]: Lady_Aleena, in the first example grep evaluates the result from grep and if true, returns $_. In the second, it always returns $_
[shmem]: ..the result from the pattern match

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