Merge pull request #60 from fjwhittle/master

Add Challenge 004.2 solution

1 files changed, 17 insertions, 0 deletions

diff --git a/challenge-004/fjwhittle/perl6/ch-2.p6 b/challenge-004/fjwhittle/perl6/ch-2.p6
new file mode 100644
index 0000000000..6ffc0f97d3
--- /dev/null
+++ b/challenge-004/fjwhittle/perl6/ch-2.p6
@@ -0,0 +1,17 @@
+#!/usr/bin/env perl6
+
+use v6;
+
+#| Find words in a file that contain only the given letters
+unit sub MAIN(
+  Str $file #= file containing list of words
+          where { given .IO { .r && ( .l || .f) or die "Cannot read from $_" } },
+  *@letters #= list of letters to search for
+);
+
+my $letter-bag := @letters.hyper.map(*.lc.comb(/ \w /)).flat.Bag;
+
+my @words = $file.IO.lines.unique.hyper.grep(*.chars > 2)
+                 .map: { .lc.comb(/ \w /).Bag => $_ };
+
+@words.hyper.grep(*.key ⊆ $letter-bag)».value.unique(with => *.lc eq *.lc).join(', ').put;