exercism-73 Secret handshake

Author: kumar91gopi

README.md

@@ -294,6 +294,7 @@ solution of many challenges of [Leetcode](https://leetcode.com/), [Exercism](htt
 70. [Beer Song](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/beer_song.rb)
 71. [Protein Translation](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/protein_translation.rb)
 72. [Wordy](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/wordy.rb)
+73. [Secret Handshake](https://github.com/kumar91gopi/Algorithms-and-Data-Structures-in-Ruby/blob/master/exercism/secret_handshake.rb)
 
 <a name="leetcode"/>
 

exercism/secret_handshake.rb

@@ -0,0 +1,40 @@
+# Problem: https://exercism.org/tracks/ruby/exercises/secret-handshake
+
+# Solution
+class SecretHandshake
+    ACTIONS = ["wink", "double blink", "close your eyes", "jump"]
+
+    def initialize(number)
+      @number = number.is_a?(Integer) ? number : 0
+    end
+    
+    def commands
+      actions =[]
+      bit_len = @number.digits(2).length
+      return actions if @number.zero?
+
+      for i in 0..(bit_len>3 ? 3 : bit_len)
+        actions.push(ACTIONS[i]) if (@number & (1<<i)) >0
+      end
+      @number & (1<<4) >0 ?  (actions.reverse) : actions
+    end
+end
+
+# Solution 2
+class SecretHandshake
+    ACTIONS = ["wink", "double blink", "close your eyes", "jump"]
+    def initialize(number)
+      @binary_digits = number.is_a?(Integer) ? (number.digits(2)) : []
+    end
+    
+    def commands
+      actions =[]
+      return actions if @binary_digits.empty?
+      
+      len = @binary_digits.length
+      for i in 0...(len>4 ? len-1 : len)
+        actions.push(ACTIONS[i]) if @binary_digits[i]==1
+      end
+      (len>4 and @binary_digits[-1]==1) ? (actions.reverse) : actions
+    end
+end