Ruby solution for week 4, part 2

2 files changed, 43 insertions, 0 deletions

diff --git a/challenge-004/abigail/README.md b/challenge-004/abigail/README.md
index 07a11c980b..75267e87b2 100644
--- a/challenge-004/abigail/README.md
+++ b/challenge-004/abigail/README.md
@@ -52,3 +52,4 @@ The sets of letters are read from standard input.
 * [Node.js](node/ch-2.js)
 * [Perl](perl/ch-2.pl)
 * [Pyton](python/ch-2.py)
+* [Ruby](ruby/ch-2.rb)
diff --git a/challenge-004/abigail/ruby/ch-2.rb b/challenge-004/abigail/ruby/ch-2.rb
new file mode 100644
index 0000000000..5dfcb0afce
--- /dev/null
+++ b/challenge-004/abigail/ruby/ch-2.rb
@@ -0,0 +1,42 @@
+#!/usr/bin/ruby
+
+#
+# See ../README.md
+#
+ 
+#
+# Run as: ruby ch-2.rb < input-file
+#
+
+require "optparse"
+
+#
+# Parse options
+#
+params   = ARGV . getopts ('f:')
+filename = params ["f"]
+
+
+#
+# Find words from the file 'filename' which can be made
+# from the letters in 'letters'.
+#
+def find_words (filename, letters)
+    letters = letters . downcase . split (//)
+    File . open (filename) do |f|
+        f . each_line do |word|
+            copy = word . downcase
+            letters . each do |letter|
+                copy . sub! letter, ""
+            end
+            if copy == ""
+                puts (word)
+            end
+        end
+    end
+end
+
+
+ARGF . each_line do |letters|
+    find_words filename, letters
+end