From: Stefano Crocco <redmine@...>
Date: 2009-02-06T17:22:40+09:00
Subject: [ruby-core:21880] [Bug #1117] Array#choice always produces the same sequence

Bug #1117: Array#choice always produces the same sequence
http://redmine.ruby-lang.org/issues/show/1117

Author: Stefano Crocco
Status: Open, Priority: Normal
ruby -v: 1.8.7-p72

In ruby 1.8.7-p72, Array#choice produces the same sequence of elements every time the script is run. For example:

ruby -e 'p [1,2,3,4].choice'
=> 4
ruby -e 'p [1,2,3,4].choice'
=> 4
ruby -e 'p [1,2,3,4].choice'
=> 4
ruby -e 'p [1,2,3,4].choice'
=> 4

According to the documentation, I'd expect this to give a different result every time. To achieve the result I expect, I need to call Kernel#srand before Array#choice:

ruby -e 'srand; p [1,2,3,4].choice'
=> 4
ruby -e 'p [1,2,3,4].choice'
=> 2
ruby -e 'p [1,2,3,4].choice'
=> 3
ruby -e 'p [1,2,3,4].choice'
=> 2


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