lib/perobs/BigArray.rb in perobs-4.1.0 vs lib/perobs/BigArray.rb in perobs-4.2.0

@@ -121,11 +121,15 @@
 
     # Return the value stored at the given index.
     # @param index [Integer] Position in the array
     # @return [Integer or nil] found value or nil
     def [](index)
-      index = validate_index_range(index)
+      begin
+        index = validate_index_range(index)
+      rescue IndexError
+        return nil
+      end
 
       return nil if index >= @entry_counter
 
       @root.get(index)
     end
@@ -186,9 +190,23 @@
     alias size length
 
     # Return true if the BigArray has no stored entries.
     def empty?
       @entry_counter == 0
+    end
+
+    # Return the first entry of the Array.
+    def first
+      return nil unless @first_leaf
+
+      @first_leaf.values.first
+    end
+
+    # Return the last entry of the Array.
+    def last
+      return nil unless @last_leaf
+
+      @last_leaf.values.last
     end
 
     # Iterate over all entries in the tree. Entries are always sorted by the
     # key.
     # @yield [key, value]