Re: local binding, too local...

[Jean-Christophe Helary]

> On Dec 8, 2018, at 15:48, Yuri Khan <yurivkhan@gmail.com> wrote:
> 
> On Sat, Dec 8, 2018 at 9:19 AM Jean-Christophe Helary
> <brandelune@gmail.com> wrote:
> 
>> In a defun I wrote I have a let* block that does something, then some setf 
>> code, then a let block that does something on the values created by setf, 
>> but the let block needs a value that it set in the let* block.
> 
> The customary way is to put the consumer block within the producer block:
> 
>    (defun foo ()
>      (let* ((bar '(baz quux)))
>        (setf (car bar) 'xyzzy)
>        (let ((plugh (cdr bar)))
>          (message "%s" plugh))))

Eventually that's what I did. But I was not sure if that would be considered a 
"hack" or is the correct way to think about things.

>> I would like to keep things local, but not *that* local, just *defun* local.
>> 
>> Is there a clean way to declare variables local to a defun and without being 
>> locked by let\*? blocks ?
> 
> let and let* are *binding* forms, not *assignment* statements. The
> bindings go in scope, the body is executed, the bindings go out of
> scope.
> 
> setq, on the other hand, is an assignment form. If a named variable
> exists in the current scope, it will reset its value.

I'm not sure I understand the difference yet between binding and assigning yet.


Jean-Christophe Helary
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http://mac4translators.blogspot.com @brandelune