How does Ruby's Array.| compare elements for equality?
- by Max Howell
Here's some example code:
class Obj
attr :c, true
def == that
p '=='
that.c == self.c
end
def <=> that
p '<=>'
that.c <=> self.c
end
def equal? that
p 'equal?'
that.c.equal? self.c
end
def eql? that
p 'eql?'
that.c.eql? self.c
end
end
a = Obj.new
b = Obj.new
a.c = 1
b.c = 1
p [a] | [b]
It prints 2 objects but it should print 1 object. None of the comparison methods get called. How is Array.| comparing for equality?
