From: matz@... (Yukihiro Matsumoto)
Date: 2004-02-16T15:33:59+09:00
Subject: Re: Hash#values_at

Hi,

In message "Hash#values_at"
    on 04/02/16, "Ara.T.Howard" <Ara.T.Howard@noaa.gov> writes:
|
|what is the rational behind this?
|
|  ({}.values_at :a).empty? #=> false
|
|i would expect
|
|  ({}.values_at :a) #=> nil
|
|or
|
|  ({}.values_at :a) #=> []
|
|but not the actual
|
|  ({}.values_at :a) #=> [nil]
|
|there must be some reason for this, but i cannot see why returning an 'array
|full of nothing' is preferable to returning an 'emtpy array'...  is there some
|way of thinking about this that will make it seem less suprising?

 def values_at(*args)
   args.collect do |i|
     self[i]
   end
 end

							matz.