From: George <george.ogata@...>
Date: 2007-10-12T12:31:15+09:00
Subject: Re: will #in? be in ruby2? (was Re: Finding shared elements between to arrays.)

On 10/10/07, Robert Dober <robert.dober@gmail.com> wrote:
> On 10/10/07, Robert Dober <robert.dober@gmail.com> wrote:
> <snip>
> > containment) , but I would rather compare
> >
> > a3 = a1.select{ |e| e.in? a2}
> >
> > to
> >
> > a3 = a1 & a2
> >
> ... but it is not the same :( , & eliminates duplicates, always forget
> about this :(

Also, #& uses #eql? whereas #include? uses #== .