From: "Jan E." <lists@...>
Date: 2012-04-13T16:53:10+09:00
Subject: Re: How to test if array element exists?

Hi,

If you access a non-existing index, you get nil. That is, your 
expression [array[4]] evaluates to [nil], which is not empty (but has 
exactly one element).

The only way to test for existence is to check the length of the array:

if 4 >= array.length
  puts 'no index 4'
end

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