challenge-004 andrezgz solution

challenge-004/andrezgz/perl5/ch-1.pl

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+#!/usr/bin/perl
+
+# https://perlweeklychallenge.org/blog/perl-weekly-challenge-004/
+# Challenge #1
+# Write a script to output the same number of PI digits as the size of your script.
+# Say, if your script size is 10, it should print 3.141592653.
+
+use strict;
+use warnings;
+
+use Math::BigFloat qw/bpi/;
+print bpi(-s $0);

challenge-004/andrezgz/perl5/ch-2.pl

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+#!/usr/bin/perl
+
+# https://perlweeklychallenge.org/blog/perl-weekly-challenge-004/
+# Challenge #2
+# You are given a file containing a list of words (case insensitive 1 word per line) and a list of letters.
+# Print each word from the file than can be made using only letters from the list.
+# You can use each letter only once (though there can be duplicates and you can use each of them once),
+# you don’t have to use all the letters.
+
+use strict;
+use warnings;
+
+die "Usage: ch-2.pl <words_file> <letters_list>" if scalar(@ARGV) < 2;
+
+my $words_file = $ARGV[0];
+my $letters_list = $ARGV[1];
+
+#Make a hash with available letters and quantity
+my %letters;
+for my $l (split /,/,$letters_list ){
+    $letters{ lc($l) }++;
+}
+
+open(my $fh, "<", $words_file) or die "Could not open words file '$words_file': $!";
+
+while( my $word = <$fh> ) {
+    chomp $word; #remove new line trailing string
+    print $word.$/ if is_word_printable( lc $word , %letters );
+}
+close $fh;
+
+#Return 1 if $word is composed by letters on the hashed list %letters
+sub is_word_printable {
+    my ( $word, %letters ) = @_;
+    foreach my $l (split //,$word ){
+        return 0 unless (exists $letters{ $l } && $letters{ $l } > 0);
+        $letters{ $l }--;
+    }
+    return 1;
+}