From: Stefano Crocco <stefano.crocco@...>
Date: 2009-02-05T21:00:36+09:00
Subject: Array#choice always produce the same sequence

I've just stumbled upon a strange behaviour of Array#choice (using ruby 1.8.7-
p72). As far I understand, an_array.choice should be (almost) the same as 
an_array[rand(an_array.size)]. Thus, the two following pieces of code should 
be equivalent

a = [1, 2, 3, 4]
p 10.times.map{a.choice}.join
p 10.times.map{a[rand(a.size)].join}

However, this doesn't seem to be the case. In particular, something like:

ruby -e 'a = [1, 2, 3, 4]; p 10.times.map{a.choice}.join'

always give the same result, while