exercism 60

Author: kumar91gopi

Diff for: README.md

@@ -277,6 +277,7 @@ solution of many challenges of [Leetcode](https://leetcode.com/), [Exercism](htt
 57. [Seive](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/seive.rb)
 58. [Proverb](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/proverb.rb)
 59. [Palindrome Products](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/palindrome_products.rb)
+60. [Parallel Letter Frequency](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/parallel_letter_frequency.rb)
 
 <a name="leetcode"/>
 

Diff for: exercism/parallel_letter_frequency.rb

@@ -0,0 +1,17 @@
+#Problem: https://exercism.org/tracks/ruby/exercises/parallel-letter-frequency
+
+#Solution
+class ParallelLetterFrequency
+    def self.count(texts)
+      ret_val = Hash.new(0)
+      return ret_val if texts.empty?
+      threads = texts.map do |text|
+        Thread.new do
+          format_text = text.downcase.gsub(/[^\p{L}a-z]/, '')
+          format_text.each_char { |char| ret_val[char] += 1 }
+        end
+      end
+      threads.each(&:join)
+      ret_val
+    end
+end