#!/usr/local/bin/perl -w
use strict;
use Benchmark;
my $count =500000;
## Method number one
sub One {
   my $data = 'for bar baz';
   $data = uc $data;

}

## Method number two
sub Two {
   my $data = 'for bar baz';
   $data =~ tr/a-z/A-Z/;
}
## Method number Three
sub Three {
   my $data = 'for bar baz';
   $data =~ s/([A-Za-z]+)/uc($1)/ge;
}
## We'll test each one, with simple labels
timethese (
  $count,
  {'Method One UC' => '&One',
   'Method Two TR' => '&Two',
   'Method Three s'=> '&Three'
   }
);

exit;

##</code><code>##

Benchmark: timing 500000 iterations of Method One UC, Method Three s, Method Two TR...
Method One UC:  1 wallclock secs ( 1.42 usr +  0.00 sys =  1.42 CPU) @ 352112.68/s (n=500000)
Method Three s: 16 wallclock secs (17.03 usr +  0.00 sys = 17.03 CPU) @ 29359.95/s (n=500000)
Method Two TR:  1 wallclock secs ( 2.04 usr +  0.00 sys =  2.04 CPU) @ 245098.04/s (n=500000)

##</code><code>##

 my $data = 'for-bar-baz';
   $data =~ s/-/_/g;
   print $data;
 my $data = 'for-bar-baz';
 $data =~tr/-/_/;
 print $data;

##</code><code>##

Benchmark: timing 500000 iterations of Method One TR, Method Two s...
Method One TR:  2 wallclock secs ( 1.87 usr +  0.00 sys =  1.87 CPU) @ 267379.68/s (n=500000)
Method Two s:  5 wallclock secs ( 4.84 usr +  0.00 sys =  4.84 CPU) @ 103305.79/s (n=500000)