From: SonOfLilit <sonoflilit@...>
Date: 2007-02-14T05:42:00+09:00
Subject: Re: quick newbie true/false/nil question

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Like in C, assignment returns IIRC the result of the assignment, so:

 ( (a = 2+3) == 5 ) == true

On 2/13/07, Jason Mayer <slamboy@gmail.com> wrote:
>
> On 2/13/07, Jeff <cohen.jeff@gmail.com> wrote:
> >
> >
> >
> > On Feb 13, 2:24 pm, "Jason Mayer" <slam...@gmail.com> wrote:
> > > I ran across this line of code today, and it doesn't make sense to me.
> > >
> > >   if ((klass = CommDispatcher.check_hash(path)) == nil)
> > >
> > > How would that value ever equal nil?  I thought that if klass failed
> to
> > be
> > > assigned to the value of CommDispatcher.check_hash(path) then the
> value
> > > would be false and if it was assigned to the value of
> > > CommDispatcher.check_hash(path) it would be true..  How would it be
> nil?
> > >
> > > Thanks!
> >
> > I'm not familiar with the CommDispatcher class, but it looks like
> > klass will be assigned whatever the return value of check_hash()
> > returns, whether that's nil or false or something else.
> >
> > Jeff
>
>
>
> Right... but isn't the assignment of the value 'nil' going to return true
> since the assignment succeeded?  I remember screwing up a program by
> forgetting to put in the extra = sign once... my if blah = blah2 statement
> always returned true because the assignment occurred.
>

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