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Re: if vs. when vs. and: style question
From: |
Emanuel Berg |
Subject: |
Re: if vs. when vs. and: style question |
Date: |
Wed, 25 Mar 2015 01:21:32 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.4 (gnu/linux) |
Rusi <rustompmody@gmail.com> writes:
> In general weaker is better
> http://www.w3.org/2001/tag/doc/leastPower.html
>
> (when a b) ... (if a b) However (if a b c) ... (when ??)
What do you mean by "weaker"?
`if' can do three arguments, on the other hand it
needs a `progn' to do several forms. `when' comes with
implicit progn but cannot do the three way
if-else if-else branch.
What I can see `if' is more flexible and you can
change things without having to change the outermost
`if', which is practical. Yes, with the use of `not'
and `progn' if necessary, but I don't see a problem
with that.
> Other example:
>
> destructuring-bind is strictly weaker than if/cond
> and so better when usable
What is "destructuring-bind"?
What do you mean by "strictly weaker"? ("Strictly
less" is (a < b) as opposed to (a <= b) which is
"less than or equal".)
If what you mean by "weaker" is some attempt at
a formalization of "you can do less" then I do not
agree that should be preferred by definition.
For example, here
(1+ 5) ; 6
(+ 1 5) ; 6
I'm sure (1+ 5) looks better to some, but think it is
even steven. It depends. The (+ ... ) construct is
very familiar. And there, the "1" can be changed, or
replaced by a variable name.
If you use the most powerful construct, you can stick
to that, everywhere. The code looks uniform and is
fast to edit.
Of course, if you do enough `when' and `unless' and
three-way `if's then it will probably all look uniform
to you pretty soon, as well. Personally I prefer only
`if's but I'm only mildly passionate about it.
For example, if I inherited code I wouldn't change the
`when's and `unless'es.
--
underground experts united
- if vs. when vs. and: style question, Marcin Borkowski, 2015/03/23
- RE: if vs. when vs. and: style question, Drew Adams, 2015/03/23
- Re: if vs. when vs. and: style question, Pascal J. Bourguignon, 2015/03/23
- Message not available
- Re: if vs. when vs. and: style question, Emanuel Berg, 2015/03/23
- Re: if vs. when vs. and: style question, Rusi, 2015/03/24
- Re: if vs. when vs. and: style question,
Emanuel Berg <=
- Re: if vs. when vs. and: style question, Pascal J. Bourguignon, 2015/03/24
- Re: if vs. when vs. and: style question, Emanuel Berg, 2015/03/24
- Re: if vs. when vs. and: style question, Rusi, 2015/03/24
- Re: if vs. when vs. and: style question, Pascal J. Bourguignon, 2015/03/25
- Re: if vs. when vs. and: style question, Rusi, 2015/03/25
- Re: if vs. when vs. and: style question, Stefan Monnier, 2015/03/25
- Re: if vs. when vs. and: style question now Unicode, Dan Espen, 2015/03/25
- Re: if vs. when vs. and: style question now Unicode, Rusi, 2015/03/25
- Re: if vs. when vs. and: style question now Unicode, Dan Espen, 2015/03/25
- Re: if vs. when vs. and: style question now Unicode, Rusi, 2015/03/25