ch06.007_best

Perl Best Practices the source code

##############################################################################
##   Code fragment (Recommended) from Chapter 6 of "Perl Best Practices"    ##
##     Copyright (c) O'Reilly & Associates, 2005. All Rights Reserved.      ##
##  See: http://www.oreilly.com/pub/a/oreilly/ask_tim/2001/codepolicy.html  ##
##############################################################################


# Standard modules...
use strict;
use warnings;
use IO::Prompt;
use Carp;
use English qw( -no_match_vars );
use Data::Alias;
use Readonly;

Readonly my $EPSILON => 0.01;

sub find_anomolous_sample_in {
    my ($samples_ref) = @_;
 
    MEASUREMENT:
    for my $measurement(@{$samples_ref}) {
        last MEASUREMENT if $measurement < 0;
 
        my $floor = int($measurement);
        next MEASUREMENT if $floor == $measurement;
 
        my $allowed_inaccuracy = scale($EPSILON, $floor);
        return $measurement 
            if $measurement-$floor > $allowed_inaccuracy;
    }
    return;
}



my @samples = (1..10, 12.2);

use Data::Dumper 'Dumper';
warn Dumper [
    find_anomolous_sample_in(\@samples)
];

sub scale {
    my ($eps, $val) = @_;
    return $eps * $val;
}