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#!/usr/bin/env perl
# vim:set ts=4 sw=4 sts=4 et ai wm=0 nu:
#=============================================================================
# Copyright (c) 2025, Bob Lied
#=============================================================================
# ch-2.pl Perl Weekly Challenge 332 Task 2 Odd Letters
#=============================================================================
# You are given a string. Write a script to find out if each letter in
# the given string appeared odd number of times.
# Example 1 Input: $str = "weekly" # Output: false
# Example 2 Input: $str = "perl" # Output: true
# Example 3 Input: $source = "challenge" # Output: false
#=============================================================================
use v5.42;
use feature 'keyword_all';
no warnings 'experimental::keyword_all';
use Getopt::Long;
my $Verbose = false;
my $DoTest = false;
GetOptions("test" => \$DoTest, "verbose" => \$Verbose);
my $logger;
{
use Log::Log4perl qw(:easy);
Log::Log4perl->easy_init({ level => ($Verbose ? $DEBUG : $INFO ),
layout => "%d{HH:mm:ss.SSS} %p{1} %m%n" });
$logger = Log::Log4perl->get_logger();
}
#=============================================================================
exit(!runTest()) if $DoTest;
say (oddLetter($_) ? "true" : "false") for @ARGV;
#=============================================================================
sub oddLetter($str)
{
my %letter;
$letter{$_}++ for split(//, $str);
return all { $_ % 2 } values %letter;
}
sub runTest
{
use Test2::V0;
is( oddLetter("weekly"), false, "Example 1");
is( oddLetter("perl"), true, "Example 2");
is( oddLetter("challenge"), false, "Example 3");
is( oddLetter("xaaabbbbb"), true, "More than one");
done_testing;
}
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