From: Lin Jen-Shin <godfat@...>
Date: 2011-01-03T21:26:15+09:00
Subject: [ruby-core:34030] Hash#select and Hash#reject bug in 1.9.2?

(sorry if this is a duplicated post, i forgot to subscribe)

Block parameter with or without () is not consistent in select or
reject,
while each and map is consistent. Is this a bug?

> ruby -v
ruby 1.9.2p136 (2010-12-25 revision 30365) [x86_64-darwin10.5.0]

# each and map is consistent with or without ()

>> {a:1}.each{ |k,v| p [k,v].map(&:inspect) }
[":a", "1"]

>> {a:1}.each{ |(k,v)| p [k,v].map(&:inspect) }
[":a", "1"]

>> {a:1}.map{ |k,v| p [k,v].map(&:inspect) }
[":a", "1"]

>> {a:1}.map{ |(k,v)| p [k,v].map(&:inspect) }
[":a", "1"]

# select and reject is not consistent with or without ()

>> {a:1}.select{ |k,v| p [k,v].map(&:inspect) }
[":a", "1"]

>> {a:1}.select{ |(k,v)| p [k,v].map(&:inspect) }
[":a", "nil"]

>> {a:1}.reject{ |k,v| p [k,v].map(&:inspect) }
[":a", "1"]

>> {a:1}.reject{ |(k,v)| p [k,v].map(&:inspect) }
[":a", "nil"]

Thanks a lot!

p.s. http://redmine.ruby-lang.org is down at the moment