From: Jim Freeze <jim@...>
Date: 2001-07-13T05:52:23+09:00
Subject: [ruby-talk:17753] Re: What is Array#- ?

On Fri, 13 Jul 2001, Dave Thomas wrote:

> Jim Freeze <jim@freeze.org> writes:
>
> > irb(main):003:0> a=%w{1 1 2 2 3 3 3}
> > ["1", "1", "2", "2", "3", "3", "3"]
> > irb(main):004:0> a-["3"]
> > ["1", "2"]
> >
> > This looks like this is really the minus operation mixed with the
> > uniq operation.
> >
> > a1 - a2 => a1.uniq - a2.uniq
> > or maybe
> > a1 - a2 => (a1-a2).uniq
> >
> > Someone care to explain this behavior?
>
> Forgive the doubled minus sign - wee LaTeX -> HTML conversion
> problem. However:
>
> http://www.rubycentral.com/book/ref_c_array.html#_mi_mi
>
>
Yes, but why remove duplicates? Doesn't seem to make sense.
I was hoping for something close to set theory.

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Jim Freeze
jim@freeze.org
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