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From: bolega <gnuist006@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Re: lambda inside a let or letrec
Date: Wed, 9 Jun 2010 22:37:49 -0700 (PDT)	[thread overview]
Message-ID: <a70abe87-a774-474e-9bdd-8bcc94f51a12@z10g2000yqb.googlegroups.com> (raw)
In-Reply-To: 6b121cee-8a28-4e27-a733-40d22028e05d@i28g2000yqa.googlegroups.com

let me write it more clearly with indents as follows :

(let
((a (lambda (n) (+ 1 n)))
 (b 3))
(a b))

On Jun 9, 10:34 pm, bolega <gnuist...@gmail.com> wrote:
> My apologies in advance to comp.lang.scheme and comp.lang.lisp.
>
> I am trying to run a certain syntax inside emacs lisp.
>
> I know basically how let works
>
> (let (list of pairs of var value) (function))
>
> This is like a lambda function call , only the order is different.
>
> But the novelty i saw reading a book on common lisp or scheme is this
> and i failed to run in emacs. plz tell what modifications are needed
> and i know they are different.
>
> (   (lambda (n) (+ 1 n)) 3)  ;;; works in emacs
>
> (let
> ((a (lambda (n) (+ 1 n))) (b 3)) (a b))   ;;; does NOT work in emacs
>
> basically we are trying to use / abuse the let in that in the pair we
> define a equal to a lambda. Then another pair where a value of b is
> defined.
>
> next, we want a to operate on b.
>
> Why does it fail ?
>
> The scheme/lisp book/paper where it was seen (forgot) used letrec.
>
> Can someone enlighten me how set! and let can be used to formulate
> recursion when the let has no recursion built in it ?
>
> thanks a lot.
> cheers



  parent reply	other threads:[~2010-06-10  5:37 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-06-10  5:34 lambda inside a let or letrec bolega
2010-06-10  5:37 ` bolega
2010-06-10  6:18   ` bolega
2010-06-10  5:37 ` bolega [this message]
2010-06-10  7:22 ` Helmut Eller
2010-06-10 14:28 ` Pascal J. Bourguignon
2010-06-11  0:42 ` bolega

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