While it may be the least readable solution of the bunch (IMHO, thanks to the parens; YMMV... ), adapted to work as a uclast function, it's the speediest of the bunch ... 

# Output reformatted for readability :)

Benchmark: running juerd, seattlejohn, theguvnor, 
each for at least 5 CPU seconds...
      juerd:  6 wallclock secs 
              ( 5.18 usr +  0.00 sys =  5.18 CPU)
              @ 20926.21/s (n=108335)
seattlejohn:  6 wallclock secs 
              ( 5.36 usr +  0.00 sys =  5.36 CPU) 
              @ 47568.95/s (n=254922)
  theguvnor:  5 wallclock secs 
              ( 5.33 usr +  0.00 sys =  5.33 CPU) 
              @ 103021.21/s (n=548897)

                Rate       juerd seattlejohn   theguvnor
juerd        20926/s          --        -56%        -80%
seattlejohn  47569/s        127%          --        -54%
theguvnor   103021/s        392%        117%          --

[download]

With my test script being ...

#!perl

use strict;
use warnings;

use Benchmark qw/ cmpthese /;

my $s = "the quick brown fox\njumps over";

sub juerd {
    my ($foo) = @_;
    $foo =~ s/(.)$/uc $1/e;
    return $foo;
}

sub theguvnor {
    my ($foo) = @_;
    $foo = reverse ucfirst reverse $foo;
    return $foo;
}

sub seattlejohn {
    my($foo) = @_;
    substr( $foo, -1, 1 ) =~ tr/a-z/A-Z/;
    return $foo;
}

cmpthese( shift || -5,
{
    'juerd'       => sub { juerd($s)       },
    'theguvnor'   => sub { theguvnor($s)   },
    'seattlejohn' => sub { seattlejohn($s) },
});

[download]

    --k.


In reply to Re: Re: ucfirst(uclast(lc($user))) ? by Kanji
in thread ucfirst(uclast(lc($user))) ? by nop

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