Let* binding for running commands with a default value

Let* binding for running commands with a default value

[Heime]

I aw setting a default when an optional argument is missing 
with a let* binding.

(defun mtj-requisites (&optional act)

   (let* ( (act (or act 'go)) )
      (when (eq act 'go) (require 'clipper)) ))

Do the commands dependent on act have to be placed in the 
let* body ?  Or can one also do

(let* ( (act (or act 'go)) ) )
(when (eq act 'go) (require 'clipper))

Re: Let* binding for running commands with a default value

[CToID]

On 2024-07-07 Sun 21:55 UTC+0800, Heime <heimeborgia@protonmail.com> said:

> Or can one also do
> 
> (let* ( (act (or act 'go)) ) )
> (when (eq act 'go) (require 'clipper))

No, the `(eq act 'go)` outside doesn't know the value of `act` inside 
`let*`.  So depends on situation, the result may or may not be the same.

-- 
Best,
ID

Re: Let* binding for running commands with a default value

[Heime]

On Sunday, July 7th, 2024 at 2:25 PM, CToID <funk443@yahoo.com.tw> wrote:

> On 2024-07-07 Sun 21:55 UTC+0800, Heime heimeborgia@protonmail.com said:
> 
> > Or can one also do
> > 
> > (let* ( (act (or act 'go)) ) )
> > (when (eq act 'go) (require 'clipper))
> 
> 
> No, the `(eq act 'go)` outside doesn't know the value of `act` inside
> `let*`. So depends on situation, the result may or may not be the same.
 
The let* is then applying a different local variable, than the local variable
of the function argument.  But without the overhead associated with using setq
as

(or act (setq act 'go)) 
(when (eq act 'go) (require 'clipper))

Re: Let* binding for running commands with a default value

[CToID]

https://en.wikipedia.org/wiki/Variable_shadowing

-- 
Best,
ID