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(bbq) Re(4): Another flatfile thingy

by BBQ (Deacon)
on Aug 04, 2000 at 21:12 UTC ( #26232=note: print w/replies, xml ) Need Help??

in reply to RE: (bbq) RE: Re: Another flatfile thingy
in thread Another flatfile thingy

Nope, he just made a note of it. (Better than running with scissors though) :)

I'd like to see the results of whatever you come up with in place of s/// for. (either that or I have to RTFM and learn once and for all how to use benchmark;)

# Trust no1!

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RE: (bbq) Re(4): Another flatfile thingy
by btrott (Parson) on Aug 05, 2000 at 00:17 UTC
    Doing it in two steps is more efficient. From perlfaq4:
    It is much better faster to do this in two steps: $string =~ s/^\s+//; $string =~ s/\s+$//; Or more nicely written as: for ($string) { s/^\s+//; s/\s+$//; }
    Here's a benchmark:
    use Benchmark; timethese(500_000, { one => sub { my $foo = " perl monks "; $foo =~ s/^\s+|\s+$//g; }, two => sub { my $foo = " perl monks "; for ($foo) { s/^\s+//; s/\s+$//; } }, });
    And here are the results:
    Benchmark: timing 500000 iterations of one, two... one: 11 secs (11.75 usr 0.00 sys = 11.75 cpu) two: 8 secs ( 7.57 usr 0.00 sys = 7.57 cpu)

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