Re: [External] : Re: operations on path lists

[Emanuel Berg]

Jean Louis wrote:

>>>> (cond ((file-directory-p file) (expand-file-name file))
>>>>       (t nil))
>>> 
>>> (when (file-directory-p file) (expand-file-name file) )
>> 
>> (and (file-directory-p file)  (expand-file-name file))
>> 
>> Use `when' when the return value isn't important.
>> Helps human readers.
>
> I understand the idea, and I found `cond' serves that
> purpose better.
>
> So I follow the same purpose in the essence.
>
> In that particular example, the return value would be rather
> hidden and implied from `when'.

?

> For me that is not same as when the value is visible, such
> as `nil'.
>
> So those are differences in view points on what is helpful
> to human reader or not.
>
> If reader is familiar with `when' and not with `cond' it
> will be easier, but if readier is familiar with `cond' maybe
> that is easier.

The reader ... you, the writer, should write as good code as
possible, that will benefit everyone the same way.

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