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From: Emanuel Berg via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>
To: help-gnu-emacs@gnu.org
Subject: Re: [External] : `let' vs `let*' (was: Re: How do I pass a variable defined in a wrapping let, to a lambda?)
Date: Wed, 16 Mar 2022 01:25:34 +0100	[thread overview]
Message-ID: <87mthq216p.fsf@zoho.eu> (raw)
In-Reply-To: YjCzpNiuU8/DyXrA@tuxteam.de

Re: [External] : `let' vs `let*' (was: Re: How do I pass a variable defined in a wrapping let, to a lambda?)
tomas wrote:

>   (setq a 42)
>   (setq b 43)
>   (let ((a b)
>         (b a))
>     (list a b))
>
>   => (43 42)
>
> [...] And one could ask oneself whether it's wise to shadow
> variables from the outer environment

And the answer is: it is foolish.

So, examples are academic, and in practice it doesn't
make sense?

No:

  1. Let `let' be `let*'; and

  2. let let* be an alias to `let'.

So then we would have:
[f -> g denotes (defalias 'f #'g) ]

 obsolete/remove
       ↓
       ↓       dlet* -> dlet
       ↓        let*  -> let
lexical-let -> llet* -> llet -> let _or_ slet [note]
               slet* -> slet

[note] Both make sense: `let' by convention, and intuitive
       that the well-known let under static/lexical scope is
       llet (the lexical let); OHOH it could be alias to slet
       just as well to uphold consistency with the others, as
       dlet means ONLY dynamic/special and slet means ONLY
       static/lexical, so llet should perhaps then mean only
       static/lexical as well which then would be = slet.

`let' is/can be static/lexical AND/OR dynamical/special, the
other two means one for all dynamic/special (dlet) and one for all
static/lexical (slet).

The one.   
The mix.  
The other. 

That's All Folks!

-- 
underground experts united
https://dataswamp.org/~incal




  parent reply	other threads:[~2022-03-16  0:25 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-11 22:44 How do I pass a variable defined in a wrapping let, to a lambda? Steinar Bang
2022-03-11 23:04 ` Eric Abrahamsen
2022-03-12  4:52   ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-03-12  6:08     ` Eduardo Ochs
2022-03-12 13:33       ` Stefan Monnier
2022-03-12 18:56         ` Eduardo Ochs
2022-03-12 19:12           ` Stefan Monnier
2022-03-12 20:17             ` Eduardo Ochs
2022-03-12 20:31               ` [External] : " Drew Adams
2022-03-12 22:33                 ` Eduardo Ochs
2022-03-12 23:14                   ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-03-13 12:19                     ` Eduardo Ochs
2022-03-13 23:46                       ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-03-13  0:20                   ` Michael Heerdegen
2022-03-12 20:34           ` tomas
2022-03-12  8:53     ` Steinar Bang
2022-03-12 14:47       ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-03-12 16:59         ` Steinar Bang
2022-03-12 17:15           ` Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-13 18:11             ` Steinar Bang
2022-03-12 19:09           ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-03-12 20:57             ` Steinar Bang
2022-03-12  8:51   ` Steinar Bang
2022-03-12  9:34     ` Steinar Bang
2022-03-12 19:13       ` Steinar Bang
2022-03-12 14:03     ` Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-13 16:06       ` Eric Abrahamsen
2022-03-13 18:20         ` Steinar Bang
2022-03-11 23:48 ` Eric Abrahamsen
2022-03-12  0:43   ` Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-12  0:52     ` Eric Abrahamsen
2022-03-12  1:00       ` Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-12  0:58     ` Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-12  1:37   ` Michael Heerdegen
2022-03-12  2:18     ` Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-12  6:40       ` Jean Louis
2022-03-14 13:57         ` `let' vs `let*' (was: Re: How do I pass a variable defined in a wrapping let, to a lambda?) Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-15  7:36           ` Jean Louis
2022-03-15  8:30             ` Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-15 15:26           ` [External] : " Drew Adams
2022-03-15 15:41             ` tomas
2022-03-15 22:40               ` [External] : `let' vs `let*' Stefan Monnier via Users list for the GNU Emacs text editor
2022-03-16  0:25               ` Emanuel Berg via Users list for the GNU Emacs text editor [this message]
2022-03-15 17:16             ` [External] : `let' vs `let*' (was: Re: How do I pass a variable defined in a wrapping let, to a lambda?) Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-14 14:51         ` How do I pass a variable defined in a wrapping let, to a lambda? Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-12  2:19     ` Eric Abrahamsen
2022-03-11 23:58 ` Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-12  0:47   ` Emanuel Berg via Users list for the GNU Emacs text editor

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