diff --git a/plus_one.rb b/plus_one.rb
new file mode 100644
index 0000000..38c41e8
--- /dev/null
+++ b/plus_one.rb
@@ -0,0 +1,15 @@
+def plus_one(digits)
+    puts digits
+    str = ""
+    digits.each_index { |i|
+        puts digits[i]
+        str = str + digits[i].to_s
+        puts "this is #{str}"
+    }
+    x = str.to_i
+    x = x+1
+    return x.to_s.scan(/./).map {|e| e.to_i }
+end
+
+x = [4,3,2,1]
+puts plus_one(x)
\ No newline at end of file