+ Array#delete_if_at

Allow deletion of an element from the array iff it's at a given position (or in
a given range of positions).

1 files changed, 11 insertions, 0 deletions

diff --git a/lib/rbot/core/utils/extends.rb b/lib/rbot/core/utils/extends.rb
index b1964617..84833d9f 100644
--- a/lib/rbot/core/utils/extends.rb
+++ b/lib/rbot/core/utils/extends.rb
@@ -108,6 +108,17 @@ class ::Array
     self.delete_at(index)
   end
 
+  # This method deletes a given object _el_ if it's found at the given
+  # position _pos_. The position can be either an integer or a range.
+  def delete_if_at(el, pos)
+    idx = self.index(el)
+    if pos === idx
+      self.delete_at(idx)
+    else
+      nil
+    end
+  end
+
   # shuffle and shuffle! are defined in Ruby >= 1.8.7
 
   # This method returns a new array with the same items as