From 64eee76541e56d1230f2fdcab318ea81bf786e80 Mon Sep 17 00:00:00 2001
From: Xavier Noria <fxn@hashref.com>
Date: Wed, 16 Dec 2009 23:47:49 +0100
Subject: AS guide: documents Enumerable#exclude?

---
 railties/guides/source/active_support_core_extensions.textile | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'railties/guides/source/active_support_core_extensions.textile')

diff --git a/railties/guides/source/active_support_core_extensions.textile b/railties/guides/source/active_support_core_extensions.textile
index 81b6894f74..4b8e2ef691 100644
--- a/railties/guides/source/active_support_core_extensions.textile
+++ b/railties/guides/source/active_support_core_extensions.textile
@@ -864,6 +864,14 @@ If an optional block is given +many?+ only takes into account those elements tha
 @see_more = videos.many? {|video| video.category == params[:category]}
 </ruby>
 
+h4. +exclude?+
+
+The predicate +exclude?+ tests whether a given object does *not* belong to the collection. It is the negation of the builtin +include?+:
+
+<ruby>
+to_visit << node if visited.exclude?(node)
+</ruby>
+
 h3. Extensions to +Array+
 
 h4. Accessing
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