collection.rb in dolly-0.4.0

- old
+ new

@@ -12,9 +12,17 @@
       @set = Set.new
       @docs_class = docs_class
       @json = str
     end
 
+    def first
+      to_a.first
+    end
+
+    def last
+      to_a.last
+    end
+
     def map &block
       load if empty?
       @set.collect &block
     end
 