Merge pull request #8 from jbarrett/jbarrett/challenge-002

Challenge 2

3 files changed, 127 insertions, 0 deletions

diff --git a/challenge-001/john-barrett/perl5/README.md b/challenge-001/john-barrett/perl5/README.md
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+As published on https://perlweeklychallenge.org/blog/a-new-week-a-new-challenge/ <br/>
+Submissions demonstrated here using [Reply](https://metacpan.org/pod/Reply).
+
+> Write a script to replace the character ‘e’ with ‘E’ in the string ‘Perl Weekly Challenge’. Also print the number of times the character ‘e’ is found in the string.
+
+I didn't write a script so I fail this challenge already.
+
+```
+0> my $foo = 'Perl Weekly Challenge'
+$res[0] = "Perl Weekly Challenge"
+1> $foo =~ s/e/E/g;
+$res[1] = 5
+2> $foo
+$res[2] = "PErl WEEkly ChallEngE"
+3> 
+```
+
+> Write a one-liner to solve the FizzBuzz problem and print the numbers 1 through 20. However, any number divisible by 3 should be replaced by the word ‘fizz’ and any divisible by 5 by the word ‘buzz’. Those numbers that are both divisible by 3 and 5 become ‘fizzbuzz’.
+
+I don't remember where I saw this, but it is my favourite Perl5 FizzBuzz:
+
+```
+4> { no strict; no warnings; map { (fizz)[$_%3].(buzz)[$_%5]||$_ } 1..20 }
+$res[4] = [
+    [0]  1,
+    [1]  2,
+    [2]  "fizz",
+    [3]  4,
+    [4]  "buzz",
+    [5]  "fizz",
+    [6]  7,
+    [7]  8,
+    [8]  "fizz",
+    [9]  "buzz",
+    [10] 11,
+    [11] "fizz",
+    [12] 13,
+    [13] 14,
+    [14] "fizzbuzz",
+    [15] 16,
+    [16] 17,
+    [17] "fizz",
+    [18] 19,
+    [19] "buzz"
+]
+```
+
+Since I didn't write that myself I also fail the second part of the challenge. Not going well. Let's see...
+
+```
+$ perl -MAcme::FizzBuzz -e '1' | head -n 20 | tr '[:upper:]' '[:lower:]'
+1
+2
+fizz
+4
+buzz
+fizz
+7
+8
+fizz
+buzz
+11
+fizz
+13
+14
+fizzbuzz
+16
+17
+fizz
+19
+buzz
+```
+
+ There!
+
diff --git a/challenge-002/john-barrett/perl5/ch-1.pl b/challenge-002/john-barrett/perl5/ch-1.pl
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+++ b/challenge-002/john-barrett/perl5/ch-1.pl
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+#!/usr/bin/env perl
+
+# ./ch-1.pl 00123
+
+$ARGV[0] > 0 && printf (
+    ( $ARGV[0] =~ /\./
+        ? "%g\n"
+        : "%d\n" ), $ARGV[0]
+);
diff --git a/challenge-002/john-barrett/perl5/ch-2.pl b/challenge-002/john-barrett/perl5/ch-2.pl
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+++ b/challenge-002/john-barrett/perl5/ch-2.pl
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+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+use feature qw/ say /;
+
+# Usage, e.g.
+# ./ch-2.pl -to-base35 123
+# ./ch-2.pl -from-base35 ABCD
+
+my %args = @ARGV;
+my @charset = ( 0..9, 'A'..'Y' );
+my $base = @charset;
+
+say to_base35( $args{'-to-base35'} ) if $args{'-to-base35'};
+say from_base35( $args{'-from-base35'} ) if $args{'-from-base35'};
+
+sub from_base35 {
+    my ( $base35 ) = @_;
+    my $sign = $base35 =~ s/-//g ? '-' : '';
+    my @digits = split '', $base35;
+    my $idx = join '', @charset;
+    my $pos = 0;
+    my $val;
+    while ( my $char = pop @digits ) {
+        $val += index( $idx, $char ) * ( $base ** $pos );
+        $pos++;
+    }
+    $sign . $val;
+}
+
+sub to_base35 {
+    my ( $int ) = @_;
+    my $sign = ( $int < 0 ) ? '-' : '';
+    my @digits;
+    $int = abs( $int );
+    do {
+        push @digits, $charset[ $int % $base ];
+        $int = int( $int / $base );
+    } while ( $int > 0 );
+    $sign . join '', reverse @digits;
+}
+