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Re: [External] : Re: operations on path lists
From: |
Jean Louis |
Subject: |
Re: [External] : Re: operations on path lists |
Date: |
Wed, 8 Feb 2023 23:09:26 +0300 |
User-agent: |
Mutt/2.2.9+54 (af2080d) (2022-11-21) |
> > Let us look at `when' little:
> >
> > - you place `when' when you need `nil' as last resort
The above I was thinking ðŸ’, maybe by mistake, that I am answering to
Swedish friend.
> I don't. I do just the opposite. I use `when' and `unless' only
> when the code doesn't use/depend on the return value. (I'm guessing
> that's what you meant by needing nil as a last resort, though they
> always return nil.)
Thanks, I got your thinking, I like when I enter in your mind with
such details, thanks much. What interesting stuff goes on over
thousands of miles of distance.
Yes, I know those return nil. You got my idea, thanks.
> Before Elisp borrowed `when' and `unless' from other Lisps
> (e.g. Common Lisp), the idiom, especially for a single condition,
> was to use `or' in (or condition do-something) instead of `unless',
> and likewise for `and' and `when'. That that, usually at top level
> in a function body. I still have some of those `or' sexps, as does
> standard Emacs code.
Okay, I get the history, thanks.
> > - without parenthesis highlighting sometimes it becomes very difficult
> > to understand what did `if' author intended to say?
>
> I don't grok that.
With `cond' I can see, usually, what is meant with the condition, as
it is at least to me better structured than `if', as complexity of
code requires me to count parenthesis or be very careful to understand
which expression belong to which part of `if' or some `if` that
follows up. With parenthesis highlighting that is helped better.
> But then, I don't use `if' unless there are both a then and an else
> part. I take the time to rewrite, yes, as needed, to communicate to
> myself (as reader) just what the code means to do.
Yes, it is good to communicate to oneself over periods of time, I
forgot already what I was doing back in time, sometimes I study my
program to find out what did I mean with it.
--
Jean
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- Re: operations on path lists, (continued)
- Re: operations on path lists, Jean Louis, 2023/02/04
- Re: operations on path lists, Emanuel Berg, 2023/02/04
- RE: [External] : Re: operations on path lists, Drew Adams, 2023/02/04
- Re: [External] : Re: operations on path lists, Jean Louis, 2023/02/04
- Re: [External] : Re: operations on path lists, Emanuel Berg, 2023/02/05
- Re: [External] : Re: operations on path lists, Jean Louis, 2023/02/07
- Re: [External] : Re: operations on path lists, Emanuel Berg, 2023/02/07
- Re: [External] : Re: operations on path lists, Jean Louis, 2023/02/07
- RE: [External] : Re: operations on path lists, Drew Adams, 2023/02/07
- RE: [External] : Re: operations on path lists, Drew Adams, 2023/02/08
- Re: [External] : Re: operations on path lists,
Jean Louis <=
- Re: operations on path lists, Jean Louis, 2023/02/04
- Re: operations on path lists, Samuel Wales, 2023/02/04
- Re: operations on path lists, Samuel Wales, 2023/02/04
- Re: operations on path lists, Emanuel Berg, 2023/02/05
- Re: operations on path lists, Jean Louis, 2023/02/07
- Re: operations on path lists, Emanuel Berg, 2023/02/07
- RE: [External] : Re: operations on path lists, Drew Adams, 2023/02/07
- RE: [External] : Re: operations on path lists, Drew Adams, 2023/02/07
Re: operations on path lists, Emanuel Berg, 2023/02/05