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Re: local binding, too local...
From: |
Jean-Christophe Helary |
Subject: |
Re: local binding, too local... |
Date: |
Sat, 8 Dec 2018 23:45:32 +0900 |
Thank you Tomas.
So can you say that "binding" is like "creating" a variable ?
While assigning is just putting a value in that variable ?
I remember in my math classes, when we were using x and y, etc. we were binding
x and y, right ? And then when we had values for x and y we were assigning
values. Is that correct ?
Jean-Christophe
> On Dec 8, 2018, at 17:02, <tomas@tuxteam.de> <tomas@tuxteam.de> wrote:
>
> On Sat, Dec 08, 2018 at 04:37:59PM +0900, Jean-Christophe Helary wrote:
>
> [...]
>
>> I'm not sure I understand the difference yet between binding and assigning
>> yet.
>
> Binding: you associate a name (strictly: a symbol) to a place where to
> store something (a "variable").
>
> Assigning: you change the content (the thing stored in) an existing variable.
>
> Often you get those two steps in one package, and that's why the difference
> isn't so clear.
>
> Consider:
>
>
> (let ((foo 12)) ; bind a variable to the symbol foo
> ...
> (... ; some sub-scope, e.g. another let
> ; let's assume it does *not* bind foo
> (setq foo 13) ; Now the foo is bound to the same variable,
> ; but that contains now 13
> ))
>
> Things are a bit confusing, because (let ((foo 12)) ...) binds foo *and*
> assigns 12. But you could just use (let (foo) ...) in its pure form
>
> Cheers
> -- t
Jean-Christophe Helary
-----------------------------------------------
http://mac4translators.blogspot.com @brandelune
- local binding, too local..., Jean-Christophe Helary, 2018/12/07
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- Re: local binding, too local..., Yuri Khan, 2018/12/08
- Re: local binding, too local..., Jean-Christophe Helary, 2018/12/08
- Re: local binding, too local..., tomas, 2018/12/08
- Re: local binding, too local...,
Jean-Christophe Helary <=
- Re: local binding, too local..., tomas, 2018/12/08
- Re: local binding, too local..., Jean-Christophe Helary, 2018/12/08
- Re: local binding, too local..., tomas, 2018/12/09
- Re: local binding, too local..., Jean-Christophe Helary, 2018/12/09
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