File Coverage

blib/lib/Uniq.pm

Criterion	Covered	Total	%
statement	38	38	100.0
branch	11	12	91.6
condition	8	9	88.8
subroutine	5	5	100.0
pod	0	3	0.0
total	62	67	92.5

package Uniq;

use strict;
use warnings;

require Exporter;

our @ISA = qw(Exporter);

our @EXPORT = qw( uniq	dups distinct );

our $VERSION = '0.01';

sub uniq{
	# Eliminates redundant values from sorted list of values input.
	my $prev = undef;
	my @out;
	foreach my $val (@_){
		next if $prev && ($prev eq $val);
		$prev = $val;
		push(@out, $val);
	}
	return @out;
}
sub dups{
	# Returns a list of values that occur multiple times in
	# the sorted list of values supplied as input.
	my $prev = undef;
	my $ins = undef;
	my @out;
	foreach my $val (@_){
		if ($prev && $prev eq $val){
			next if ($ins && $ins eq $val);
			push(@out, $val);
			$ins = $val;

		}else{
			$prev = $val;
		}
	}
	return @out;
}
sub distinct{
	# Eliminates values mentioned more than once from a list of
	# sorted values presented.
	my $prev = undef;
	my $ctr = 0;
	my @out;
	foreach my $val (@_){
		if ($prev){
			if ($prev eq $val){
				$ctr ++;
				next;
			}
			push(@out,$prev) if ($ctr == 1);
			$prev = $val;
			$ctr  = 1;
			next;
		}else{
			$prev = $val;
			$ctr  = 1;
		}

	}
	return @out;
}
1;
__END__