From: Mikel Lindsaar <raasdnil@...>
Date: 2010-09-13T11:55:57+09:00
Subject: array[index,length] strange behaviour

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Hi all,

Running Ruby 1.8.7.  And I saw Jim Weirich's post about the Ruby Koans, =
and I thought, what the hey!  Lets do them!

So I downloaded, and what do you know!  I found something I didn't =
understand!! :)

Anyway, per http://ruby-doc.org/core/classes/Array.html#M002205 it says: =
 "Returns nil if the index (or starting index) are out of range".

So given array:

  array =3D [:peanut, :butter, :and, :jelly]

One would expect:

  array[4] =3D=3D nil #=3D> true
  array[5] =3D=3D nil #=3D> true

Which works, 4 and 5 are both out of range.

However:

  array[4,0] =3D=3D nil #=3D> false
  array[5,0] =3D=3D nil #=3D> true

Huh?  In actual fact array[4,0] returns an empty array.  This seems in =
conflict with the docs.

Can someone more enlightened please explain?

Thank you!

Mikel


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