From: Fredrik <fredjoha@...>
Date: 2008-04-29T16:55:02+09:00
Subject: Array#first is not Array#[0]

I made a class that is a subclass of Array :

class MyClass < Array
  def [](i)
    "Here you go: #{super(i)}"
  end
end

and I thought that Array#first and Array#last was just syntactic sugar
that would translate to Array#[0] and Array#[-1] respectively. But
it's not:

irb> g = MyClass.new([1,2,3])
=> [1, 2, 3]
irb> g[0]
=> "Here you go: 1"
irb> g.first
=> 1

Now, isn't that really, really crazy? Am I supposed to define
MyClass#first and MyClass#last separately???

Best regards,
Fredrik