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Re: chopping lots of characters

by Abigail-II (Bishop)
on Jun 24, 2004 at 12:38 UTC ( #369319=note: print w/replies, xml ) Need Help??


in reply to Re: chopping lots of characters
in thread chopping lots of characters

A quicky test shows that 3-arg substr is faster than chop, but a 4-arg substr is even faster - and that's to be expected because it saves a copy. Differences aren't dramatic though.
#!/usr/bin/perl use strict; use warnings; use Benchmark qw /cmpthese/; chomp (our @strings = <DATA>); cmpthese -5 => { chop => 'my @copy = @strings; foreach my $str (@copy) { chop $str; chop $str; chop $str; chop $str; }', substr3 => 'my @copy = @strings; foreach my $str (@copy) { $str = substr $str => 0, -4; }', substr4 => 'my @copy = @strings; foreach my $str (@copy) { substr $str => -4, 4 => ""; }', }; __DATA__ asdfjas;dfjas;dfjas;dkfjasdfasdf asd sdfajsd;flaks Rate chop substr3 substr4 chop 152166/s -- -11% -14% substr3 170187/s 12% -- -4% substr4 176800/s 16% 4% --

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[GrandFather]: It's a good day end here Corion. The start was somewhat less than average!
[Corion]: GrandFather: All's well that ends well? ;)
[GrandFather]: I'm fighting with a third party device our software is to support. The documentation for the device's SDK is quite a lot less than average and most of today was spent ...
[GrandFather]: discovering that one of the sensors for the device lies about the gain range it is using!
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[Corion]: GrandFather: Ah, (hardware) APIs - I have a similar situation with Chrome and its API... It is fairly underdocumented and I guess I have to hunt...
[Corion]: ... down supposedly working code to find out what I'm supposed to do

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