From: Jim Freeze <jim@...>
Date: 2003-04-08T23:33:17+09:00
Subject: Re: Array Sutraction

On Tuesday,  8 April 2003 at 22:59:50 +0900, Michael Campbell wrote:
> > 
> > I don't find this confusing. In fact I find the implicit
> > application of
> > uniq (older version) more confusing because it is somewhat
> > surprising - at
> > least to me.  In that case substraction indeed combines two
> > operations.
> > 
> > I'd view the substraction "a-b" as "remove all elements in b from
> > a",
> > which would reasonable lead to all 2's removed from [1,1,2,2,2]
> > yielding
> > [1,1].
> 
> 
> So [1, 1, 2, 2] - [2] should yield the same as [1, 1, 2, 2] - [2, 2]?
>  That seems odd to me.

Yes. It's not really subtraction as implied by the '-' minus operator.
Maybe it should be renamed to #remove_all_from. :)


-- 
Jim Freeze
----------
F:	When into a room I plunge, I
	Sometimes find some VIOLET FUNGI.
	Then I linger, darkly brooding
	On the poison they're exuding.
		-- The Roguelet's ABC