From: Mohnish Chaudhary <mohnish82@...>
Date: 2008-04-23T21:07:14+09:00
Subject: PickAxe - Understanding [] on SongList

Hi,

I am a newbie and am following Programming Ruby 2nd edition. On page 44,
there's this piece of code,

class SongList
  def initialize
    @songs = Array.new
  end
  def [](index)
    @songs[index]
  end
end

Now, the following code works fine,
list = SongList.new
...
list[0]     # this works fine, but how ?
...

What I don't understand is how is "list[0]" working ? The syntax of the
method specified is "[](index)", so how come can we pass the index
within the braces instead of after it i.e shouldn't it be "list.[](0)"?
But strangely, both work!

Please let me understand how "list[0]" works fine for the function
defined as "[](index)".

Regards,
Mohnish
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