From: Ken Bloom <kbloom@...>
Date: 2006-10-24T22:30:10+09:00
Subject: Re: '**' as hash splat?

On Mon, 23 Oct 2006 20:49:55 -0700, Trans wrote:

> We can:
> 
>   a = [2,1]
>   [3,*a]  #=> [3,2,1]
> 
> How about:
> 
>   h = {:b=>2, :a=>1}
>   {:c => 3, **h}  #=> {:c=>3, :b=>2, :a=>1}
> 
> T.

The purpose of splat is to convert an array into a list of parameters to a
method. Since [] is a method, this happens to work well for including an
array into another array. But that's not its purpose, just a side effect.

There's no real concept of converting a hash into a list of parameters to
a function, so there's no splat notation for it.

If you want to combine hashes, use the merge method

{:c=>3}.merge(h) #=> {:a=>1, :b=>2, :c=>3}

-- 
Ken Bloom. PhD candidate. Linguistic Cognition Laboratory.
Department of Computer Science. Illinois Institute of Technology.
http://www.iit.edu/~kbloom1/
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