From: Justin Collins <redmine@...>
Date: 2008-12-26T16:39:37+09:00
Subject: [ruby-core:20879] [Feature #929] Array#shuffle does not initialize random seed

Feature #929: Array#shuffle does not initialize random seed
http://redmine.ruby-lang.org/issues/show/929

Author: Justin Collins
Status: Open, Priority: Low
Category: core, Target version: 1.9.1 Release Candidate

Unlike calling Kernel#rand, Array#shuffle and Array#shuffle! do not automatically seed the random number generator. This means subsequent runs of the same program will produce the same shuffles unless a separate call is made to Kernel#rand or Kernel#srand.

For example, running just

ruby -e 'p Array.new(50) {|n| n }.shuffle'

will always give the same output.


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