[LRUG] Array.slice question

[Neil Middleton]

You're asking for no length with [3,0] hence it slicing at position 3 for 0 chars. With the second version you're using an out of range start position hence the nil.

N 

Neil

On Wednesday, 7 September 2011 at 09:29, Michael Pavling wrote:

> I'm just running through the Ruby Koans for a bit of fun, and I've
> quickly come upon a case that doesn't make sense to me. I've re-read
> the documentation, but I still don't understand why it happens.
> 
> Having a play with this array in the console:
> >> x = %w(a b c)
>  => ["a", "b", "c"]
> >> x[1]
>  => "b"
> >> x[2]
>  => "c"
> >> x[3]
>  => nil
> 
> All makes sense so far, but when I call x[3,0] I *expect* it to return
> nil (as the starting index is out of range), but it returns an empty
> array:
> >> x[3,0]
>  => []
> 
> x[4,0] behaves as I expected:
> >> x[4,0]
>  => nil
> 
> I know it's going to be me not understanding the documentation
> properly, but *unless* I can understand it, it's going to leave me
> confused. Can anyone explain it simply and clearly, please?
> 
> TIA
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