From: Ralf Mueller <ralf.mueller@...>
Date: 2012-04-13T16:36:13+09:00
Subject: Re: How to test if array element exists?

On 04/13/2012 09:31 AM, Soul Surf 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
>
> 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
>
array.include? is what you need:

 >> array = [0,1,2,3]
=> [0, 1, 2, 3]
 >> array.include?(4)
=> false
 >> array.include?(3)
=> true
 >>

used ruby-1.9.3