Add C2 & C3 answers for challenge #012

challenge-012/kian-meng-ang/perl5/ch-2.pl

@@ -0,0 +1,35 @@
+#!/usr/bin/env perl
+# vi:et:sw=4 ts=4 ft=perl
+
+use strict;
+use warnings;
+use utf8;
+use feature qw(say);
+
+use Array::Utils qw(intersect);
+
+my ($separator, @paths) = (q|/|, ());
+
+# No need $_ to prohibit useless topic
+push @paths, chomp && [split /$separator/] while (<DATA>);
+
+# Start with a base path. Compare and find common array elements against
+# subsequenty paths.
+my $common_path = shift @paths;
+@{$common_path} = intersect(@{$common_path}, @{$_}) foreach @paths;
+
+# Display the common prefix paths.
+# $ perl ch-2.pl
+# /a/b
+say join $separator, @{$common_path};
+
+# Note to self:
+# __END__ and __DATA__ token cannot mixed within the same file.
+
+1;
+
+__DATA__
+/a/b/c/d
+/a/b/cd
+/a/b/cc
+/a/b/c/d/e

challenge-012/kian-meng-ang/perl5/ch-3.pl

@@ -0,0 +1,75 @@
+#!/usr/bin/env perl
+# vi:et:sw=4 ts=4 ft=perl
+
+use strict;
+use warnings;
+use utf8;
+use feature qw(say);
+
+use Carp;
+use Config::Tiny;
+use Const::Fast;
+use HTTP::Tiny;
+use JSON::Tiny qw(decode_json);
+use XML::Hash::XS;
+
+const my $BASE_URL => 'https://www.abbreviations.com/services/v2/syno.php';
+const my $SERVICE => 'synonyms';
+
+MAIN: {
+    my $word = $ARGV[0] || croak q|Missing word!|;
+    my $word_info = _find_word_info(_config(), $word);
+
+    say $word_info->{synonyms};
+}
+
+sub _config {
+    my $rc_file = qq|$ENV{HOME}/.stands4rc|;
+    my $config = Config::Tiny->read($rc_file) || croak qq|Missing $rc_file!|;
+
+    $config->{$SERVICE}->{uid} || croak q|Missing API uid!|;
+    $config->{$SERVICE}->{token} || croak q|Missing API token!|;
+
+    return $config;
+}
+
+sub _find_word_info {
+    my ($config, $word) = @_;
+
+    my $params = {
+        uid     => $config->{$SERVICE}->{uid},
+        token   => $config->{$SERVICE}->{token},
+        word    => $word,
+        format  => 'json',
+    };
+
+    my $ua = HTTP::Tiny->new();
+    my $response = $ua->get($BASE_URL, $params);
+
+    if (!$response->{success}) {
+        croak qq|ERROR: $response->{code}, $response->{status}, $response->{reason}!|;
+        return;
+    }
+
+    # Error response is always a XML string regardless the `format` was
+    # explicitly set to `json`. See (2).
+    my $results = ($response->{content} =~ m/xml/)
+        ? xml2hash($response->{content})
+        : decode_json($response->{content})->{results};
+
+    croak qq|ERROR: $results->{error}| if (exists $results->{error});
+
+    return $results->{results}->{result};
+}
+
+1;
+
+__END__
+
+Note to self:
+(1) `HTTP::Tiny` does not have built-in way to deserialize JSON or XML response
+    data compare to `Mojo::UserAgent`.
+(2) Is there a better way to resolve inconsistency in returned HTTP body
+    content? How do we check for JSON or XML string?
+(3) Not all `XX::Tiny` CPAN modules were created or maintained equally.
+