From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2012-04-13T16:35:59+09:00
Subject: Re: How to test if array element exists?

On Fri, Apr 13, 2012 at 9:31 AM, Soul Surf <lists@ruby-forum.com> wrote:
> I'm new to Ruby and just want to test if an array element exists. Here's
> a basic code snippet:
>
> array = [0,1,2,3]
>
> if [array[4]].empty?
>  puts 'empty'
> end
> if [array[4]].nil?
>  puts 'nil'
> end

if array[4].nil?

What you are doing above is creating an array with one element, which
is never nil:

[nil].nil?

> element 4 does not exist in the array, but neither of the if statements
> result in true? what would be an if statement to check that array[4]
> does not exist? Thanks

Jesus.