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Rubygem
Description: Merb Core: All you need. None you don't.
Homepage: http://www.merbivore.com
Clone URL: git://github.com/wycats/merb-core.git 
made only and except uglier and faster

Calling include? for every key in a long list is hideously slow.

Signed-off-by: Michael S. Klishin <michael@novemberain.com>
granth (author)
Thu May 29 17:46:44 -0700 2008
michaelklishin (committer)
Sun Jun 01 23:24:49 -0700 2008
commit  34b0ccb9db639ed27e6f1158eb712e0c2a8e234c
tree    d3146cb4df6701b93918ee238e8ade9cff18af1a
parent  a70ee65be080740f0f0cbdb08ebfc608596004c6
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lib/merb-core/core_ext/hash.rb 
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@@ -126,7 +126,9 @@ class Hash
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   #   { :one => 1, :two => 2, :three => 3 }.only(:one)
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   #     #=> { :one => 1 }
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   def only(*allowed)
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-    reject { |k,v| !allowed.include?(k) }
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+    hash = {}
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+    allowed.each {|k| hash[k] = self[k] }
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+    hash
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   end
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   # @param *rejected<Array[(String, Symbol)] The hash keys to exclude.
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@@ -137,7 +139,9 @@ class Hash
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   #   { :one => 1, :two => 2, :three => 3 }.except(:one)
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   #     #=> { :two => 2, :three => 3 }
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   def except(*rejected)
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-    reject { |k,v| rejected.include?(k) }
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+    hash = self.dup
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+    rejected.each {|k| hash.delete(k) }
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+    hash
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   end
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   # @return <String> The hash as attributes for an XML tag.

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