Subject: Re: Lambda functions
From: Erik Naggum <>
Date: Sat, 22 Sep 2001 23:40:00 GMT
Newsgroups: comp.lang.lisp
Message-ID: <>

* Kent M Pitman
> I don't see anything in the ISO ISLISP spec that suggests that a lambda
> expression is a function.  Unless you can find a specific passage that
> contradicts my belief, I'm pretty sure an implementation is buggy if it
> lets you funcall a list whose car is LAMBDA.

* Anette Stegmann
> That surprises me.  I only know old LISP dialects from the time  between
> 195X and 197X. Has something changed in the meantime?

  Your reading of what Kent wrote lacks the precision he put into it.

> In my understanding a lamda expression is a way to notate a function.
> I am used to code like the following, IIRC:
>   > ((lambda (x) (+ x x))2)
>   4
>   > (setq f (lambda (x)(+ x x)))
>   > (f 4)
>   8

  If you really need exmples, the  following form is what Kent was talking

(funcall '(lambda (x) (+ x x)) 3)

  None of your examples are funcalling a _list_, but are instead funcalling
  the value of an evaluated expression.  Incidentally, the latter of your
  two examples presupposes a Lisp where functions and variables share the
  same value space.  That is appropriate over in comp.lang.scheme.  It is
  thus either (funcall f 4) or (setf (fdefinition 'f) ...) in a real Lisp.

  Why did that stupid George W. Bush turn to Christian fundamentalism to
  fight Islamic fundamentalism?  Why use terms like "crusade", which only
  invokes fear of a repetition of that disgraceful period of Christianity
  with its _sustained_ terrorist attacks on Islam?  He is _such_ an idiot.