More versatile row value access.

Added a method to allow retrieving a row value by it's corresponding parameter.

Author: enkessler

lib/cucumber/core/ast/examples_table.rb

@@ -82,6 +82,10 @@ def ==(other)
               other.data == data
           end
 
+          def [](parameter_name)
+            @data[parameter_name]
+          end
+
           def values
             @data.values
           end

spec/cucumber/core/ast/examples_table_spec.rb

@@ -75,11 +75,16 @@ module Cucumber::Core::Ast
         end
       end
 
-      describe 'accesing the values' do
+      describe 'accessing the values' do
         it 'returns the actual row values' do
           row = ExamplesTable::Row.new({'x' => '1', 'y' => '2'}, 1, location, language, comments)
           expect( row.values ).to eq ['1', '2']
         end
+
+        it "can access a row value by it's parameter name" do
+          row = ExamplesTable::Row.new({'x' => '1', 'y' => '2'}, 1, location, language, comments)
+          expect( row['x']).to eq '1'
+        end
       end
 
       describe 'equality' do