From: Kalman Noel <invalid@...>
Date: 2007-02-20T19:00:10+09:00
Subject: Re: Array#uniq - Comparison doesn't use 'eql?' and 'hash'

Wolfgang N叩dasi-Donner:
> I am confused about "Array#uniq".

Although you already have the answer on dclr, for this list's archives:
Strings are handled in a special way, as shown here:

definitions = lambda do

   alias :org_equal_op :==
   def ==(other)
     puts '== called'
     org_equal_op(other)
   end

   alias :org_hash :hash
   def hash
     puts 'hash called'
     org_hash
   end

   alias :org_eql? :eql?
   def eql?(other)
     puts 'eql? called'
     org_eql?(other)
   end

   alias :org_equal? :equal?
   def equal?(other)
     puts 'equal? called'
     org_equal?(other)
   end

end

String.module_eval &definitions
Regexp.module_eval &definitions

puts 'Regexp:'
p [ /a/, /b/, /a/, /c/, /b/ ].uniq
puts 'String:'
p %w(a b a c b).uniq

puts "\nRegards, Kalman"


__END__

Output:

Regexp:
hash called
hash called
hash called
eql? called
hash called
hash called
eql? called
hash called
hash called
hash called
hash called
hash called
[/a/, /b/, /c/]
String:
["a", "b", "c"]

Regards, Kalman