Add to_i to String

lib/string.ex

@@ -285,6 +285,11 @@ module String
       Erlang.binary_to_atom(self, 'utf8)
     end
 
+    % Returns the integer representation of this string if it is a valid integer.
+    def to_i
+      Erlang.list_to_integer(to_char_list)
+    end
+
     % Returns a copy of the original string with all lowercase letters replaced with their uppercase counterparts.
     def upcase
       Erlang.string.to_upper(to_char_list).to_bin

test/elixir/string_test.exs

@@ -97,6 +97,12 @@ three
     "Hello" = "Hello".to_str
   end
 
+  def to_i_test
+    0 = "0".to_i
+    1 = "1".to_i
+    93402 = "093402".to_i
+  end
+
   def inspect_test
     [34,102,92,110,111,34] = "f\no".inspect.to_char_list