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comp.lang.ruby

Array#uniq - Comparison doesn't use 'eql?' and 'hash'

WoNáDo

2/20/2007 7:16:00 AM

I am confused about "Array#uniq". In
http://groups.google.com/group/comp.lang.ruby/msg/e57b80... it is
described, that one has to redefine "eql?" and "hash", if one needs an own
"Array#uniq" interpretation.

I made tests with the result, that neither "eql?" nor "hash" is called. What
went wrong here?

>>>>> code >>>>>

class String
alias :org_hash :hash
alias :org_eql? :eql?
def hash
puts 'String#hash called'
self.hash
end
def eql?(other)
puts 'String#eql? called'
self.eql?(other)
end
end

puts 'Start of test'
a = ['a', 'b', 'a', 'c', 'b']
b = a.uniq
p b
puts 'End of test'

>>>>> Output >>>>>

Start of test
["a", "b", "c"]
End of test

>>>>> EoE >>>>>

Wolfgang Nádasi-Donner