From: Brian Candler <B.Candler@...>
Date: 2003-04-28T18:17:24+09:00
Subject: Re: block.call vs. yield

On Mon, Apr 28, 2003 at 06:06:36PM +0900, Gavin Sinclair wrote:
> If you want to take a step back and look for a unifying concept, which
> I applaud, then I think the only choice is to abolish "yield
> semantics".  The splat (*) operator allows you to achieve the same
> result anyway - when you want to.
> 
>   hash.each do |o|
>     # Array === o
>   end
> 
> is annoying to some people.  They would rather have an error (wrong
> number of parameters) than an unexpected value being assigned to the
> parameter, and I sympathise.

I am in that group. I have been caught out several times by writing

   mything.each do |thing|
     ..
   end

where mything is a hash of objects, and I just get a confusing error message
somewhere later on in my code, perhaps much later.

If you want to match exactly one argument you can write

   ... do |thing,|

but I never remember to do that.

Regards,

Brian.