From: Robert Klemme <shortcutter@...>
Date: 2009-02-08T01:39:14+09:00
Subject: Re: Special Hash Constructors

On 07.02.2009 16:32, Trans wrote:
> 
> On Feb 7, 8:18 am, Robert Klemme <shortcut...@googlemail.com> wrote:
> 
>> Where's the point of the rescue clause?  The error will show up much
>> later, i.e. after the method has returned.
> 
> Why would the error show later? It is just so one could pass a
> immutable, like 0 to #with without raising an error b/c it doesn't
> respond to #dup.

The code block is not executed when you invoke Hash.with - hence there 
can't be an error.  When you need it the rescue block is not there as 
the block is called from a different context.

>> Also, as Tom pointed out, this is not the same as what I proposed - not
>> even similar.
> 
> It's not?
> 
>   Hash.with([])
> 
> is not the same as
> 
>   Hash.with_arrays
> 
> ?
> 

It's closer than I initially thought.  But: I wanted these two special 
methods and not yet another generic method.  For that, we have the 
original Hash.new already.  Your version still needs an argument.  Since 
I see that we are using an Array most of the time anyway that can be 
coded into the method.  No need for another generic approach IMHO.

Cheers

	robert