From 61e8b23fe599ac54382251b44d9690f08a759fe1 Mon Sep 17 00:00:00 2001
From: Aaron Patterson <aaron.patterson@gmail.com>
Date: Fri, 1 Oct 2010 17:37:34 -0700
Subject: speed up index_by by removing a lolinject

---
 activesupport/lib/active_support/core_ext/enumerable.rb | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

(limited to 'activesupport/lib/active_support/core_ext/enumerable.rb')

diff --git a/activesupport/lib/active_support/core_ext/enumerable.rb b/activesupport/lib/active_support/core_ext/enumerable.rb
index f1103029c8..6ecedc26ef 100644
--- a/activesupport/lib/active_support/core_ext/enumerable.rb
+++ b/activesupport/lib/active_support/core_ext/enumerable.rb
@@ -90,10 +90,7 @@ module Enumerable
   #     => { "Chade- Fowlersburg-e" => <Person ...>, "David Heinemeier Hansson" => <Person ...>, ...}
   #
   def index_by
-    inject({}) do |accum, elem|
-      accum[yield(elem)] = elem
-      accum
-    end
+    Hash[map { |elem| [yield(elem), elem] }]
   end
 
   # Returns true if the collection has more than 1 element. Functionally equivalent to collection.size > 1.
-- 
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