no I didn't, it was just a guess :-) and in fact, it seems the double reverse solution is faster for small strings, while the substr solution wins in the long run. anyway, here you get full benchmark:
use strict;
use List::Util qw(shuffle);
use Benchmark qw(:all);
my $string = "ACta";
print "*** ", length($string), " characters\n";
cmpthese(1_000_000, {
uclast_substr => sub { uclast_substr($string) },
uclast_2reverse => sub { uclast_2reverse($string) },
});
$string = join ("", shuffle( 'A'..'Z', 'a'..'z' ));
print "*** ", length($string), " characters\n";
cmpthese(1_000_000, {
uclast_substr => sub { uclast_substr($string) },
uclast_2reverse => sub { uclast_2reverse($string) },
});
$string .= join ("", shuffle( 'A'..'Z', 'a'..'z' ));
$string .= join ("", shuffle( 'A'..'Z', 'a'..'z' ));
$string .= join ("", shuffle( 'A'..'Z', 'a'..'z' ));
print "*** ", length($string), " characters\n";
cmpthese(1_000_000, {
uclast_substr => sub { uclast_substr($string) },
uclast_2reverse => sub { uclast_2reverse($string) },
});
$string .= join ("", shuffle( 'A'..'Z', 'a'..'z' ));
$string .= join ("", shuffle( 'A'..'Z', 'a'..'z' ));
$string .= join ("", shuffle( 'A'..'Z', 'a'..'z' ));
$string .= join ("", shuffle( 'A'..'Z', 'a'..'z' ));
$string .= join ("", shuffle( 'A'..'Z', 'a'..'z' ));
$string .= join ("", shuffle( 'A'..'Z', 'a'..'z' ));
$string .= join ("", shuffle( 'A'..'Z', 'a'..'z' ));
$string .= join ("", shuffle( 'A'..'Z', 'a'..'z' ));
$string .= join ("", shuffle( 'A'..'Z', 'a'..'z' ));
print "*** ", length($string), " characters\n";
cmpthese(1_000_000, {
uclast_substr => sub { uclast_substr($string) },
uclast_2reverse => sub { uclast_2reverse($string) },
});
sub uclast_substr {
my($string) = @_;
$string = lc(substr($string, 0, length($string)-1))
. uc(substr($string, -1, 1));
return $string;
}
sub uclast_2reverse {
my($string) = @_;
$string = reverse ucfirst lc reverse $string;
return $string;
}
and here the result:
*** 4 characters
Rate uclast_substr uclast_2reverse
uclast_substr 566572/s -- -15%
uclast_2reverse 666223/s 18% --
*** 52 characters
Rate uclast_substr uclast_2reverse
uclast_substr 470588/s -- -6%
uclast_2reverse 500000/s 6% --
*** 208 characters
Rate uclast_2reverse uclast_substr
uclast_2reverse 249938/s -- -9%
uclast_substr 273523/s 9% --
*** 676 characters
Rate uclast_2reverse uclast_substr
uclast_2reverse 102239/s -- -19%
uclast_substr 126231/s 23% --
cheers,
Aldo
King of Laziness, Wizard of Impatience, Lord of Hubris