On Sat, Aug 23, 2014 at 11:56 AM, Christophe Gragnic <christophegrag...@gmail.com> wrote: > On Sat, Aug 23, 2014 at 3:13 PM, Alexander Burger <a...@software-lab.de> > wrote: >>> Is there somewhere some info about "" being NIL? >> http://software-lab.de/doc/ref.html#nilSym >> http://software-lab.de/doc/ref.html#nilSym-io > > Thanks. I knew about this links, I just wanted to know why. > >>> The language I'm trying to embed in PicoLisp would love to have >>> "" and NIL different ! >> >> Why? I believe this is a wonderful feature! A lot of PicoLisp's >> expressive power is a result of this universality of NIL. > > This kind of answers my question ! > I understand this being a power, a kind of polymorphism, like > in Python where the boolean value of "", [],… is False. > But in the language I design, I'd like to have separate values > for "" and NIL. In fact, NIL doesn't exists at all! > > I'm afraid this is a big problem for me. > Maybe I'll try with a special symbol…
If NIL doesn't exist at all, then why do you need to expose it? If you language exposes lists or strings then empty ones carry the same meaning. -Michel > > > chri > > -- > > http://profgra.org/lycee/ (site pro) > http://delicious.com/profgraorg (liens, favoris) > https://twitter.com/profgraorg > http://microalg.info > -- > UNSUBSCRIBE: mailto:picolisp@software-lab.de?subjectUnsubscribe -- UNSUBSCRIBE: mailto:picolisp@software-lab.de?subject=Unsubscribe
