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% --
