1 files changed, 12 insertions, 0 deletions
diff --git a/ruby/extend_array.rb b/ruby/extend_array.rb
new file mode 100755
index 0000000..9b00917
--- /dev/null
+++ b/ruby/extend_array.rb
@@ -0,0 +1,12 @@
+#!/usr/bin/env ruby
+
+
+class Array
+  def sum
+    self.inject(:+)
+  end
+end
+
+a = [1,2,3]
+puts a.sum
+