From: Albert Schlef <albertschlef@...>
Date: 2008-05-02T22:05:50+09:00
Subject: Re: Extracting a value from an array

Thanks you all for these snippets.

However, the snippets you gave me may fail, because there's one detail I 
neglected to mention --as I thought it was obvious from my code:

The 'content-type' header may be missing. That's because servers don't 
always return it: in '302 redirect' replies there isn't a 'content-type' 
at all.

The problem with the snippets I was given here is that they 
unconditionaly do [:value] on some expression. When the 'content-type' 
is missing, the expression is 'nil', and since the [] method isn't 
defined for NilClass, the code fails with an exception.

I know I can change your "some_expression.first[:value]" to 
"(some_expression || {}).first[:value]" and then things would work. OK. 
But I wondered if there's some nifty solution. I don't mind seeing a 
Ruby 1.9 only solution (or a Ruby 2.0 one) --though I'm using 1.8, this 
question is mostly to satisfy my curiosity.
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