From: "Hal E. Fulton" <hal9000@...>
Date: 2000-12-03T07:40:06+09:00
Subject: [ruby-talk:6754] Re: Array Intersect (&) question

> 3) Finally, I believe there is a logic bug in the current intersect
> functionality. I actually would expect that two arrays, both with the same
> dup elements would yield that dup in the intersection:
>
>   a2 = %w# 1 1 y #      -> ["1", "1", "y"]
>   a3 = %w# 1 y 1 z #    -> ["1", "y", "1", "z"]
>   a2 & a3               -> ["1", "y"]
>
> Whereas I believe the true intersection of a2 & a3 should be
> ["1", "1", "y"] . Opinions?
>

Hmm, I can't agree with you on this one. The very term "intersect"
suggests to me a mathematical set; a set intersection (in math)
never results in duplicates because sets can't have duplicates.

Just my 1.2 yen.

Hal Fulton