From: Kenneth McDonald <kenneth.m.mcdonald@...>
Date: 2006-10-14T06:22:32+09:00
Subject: Re: Any way to get lists to throw exceptions on incorrect accesses?

James Edward Gray II wrote:
> On Oct 12, 2006, at 11:26 PM, Kenneth McDonald wrote:
>
>> Yep, got that one. Unfortunately, there's no equivalent for lists.
>
> >> array, hash = Array.new, Hash.new
> => [[], {}]
> >> array.fetch(999)
> IndexError: index 999 out of array
>         from (irb):2:in `fetch'
>         from (irb):2
>         from :0
> >> hash.fetch(:missing)
> IndexError: key not found
>         from (irb):3:in `fetch'
>         from (irb):3
>         from :0
>
> James Edward Gray II
>
>
Sorry, shoulda phrased more clearly; there's no solution that checks 
indexing on all the various list ops that uses indexing.

It doesn't really matter, from what's been said, this doesn't seem to be 
a major issue when programming in Ruby.