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Re: never use `eval' (was: Re: How to mapcar or across a list?)
From: |
John Mastro |
Subject: |
Re: never use `eval' (was: Re: How to mapcar or across a list?) |
Date: |
Wed, 15 Jul 2015 17:18:14 -0700 |
>> I would use something like this:
>>
>> (defmacro ...
>
> Macros never liked me, and that is mutual. Are they
> really preferrable to `eval'?
Yes, I think so. I certainly don't see any advantages to `eval' where a
function or macro would work.
> This is what it looks like:
>
> (eval `(create-book nil ,title ,@data))
>
> With `apply', won't the last "data" be a list, i.e.
>
> (a b ... n)
>
> instead of
>
> a b ... n
No, that's `funcall'. For example, these both evaluate to 6:
(apply #'+ '(1 2 3))
(apply #'+ 1 2 '(3))
--
john
- How to mapcar or across a list?, Marcin Borkowski, 2015/07/15
- Message not available
- Re: never use `eval' (was: Re: How to mapcar or across a list?), Barry Margolin, 2015/07/15
- Re: never use `eval' (was: Re: How to mapcar or across a list?), Emanuel Berg, 2015/07/15
- Re: never use `eval' (was: Re: How to mapcar or across a list?), Emanuel Berg, 2015/07/16
- Message not available
- Re: never use `eval', Pascal J. Bourguignon, 2015/07/16
- Re: never use `eval', Emanuel Berg, 2015/07/16
- Re: never use `eval', Barry Margolin, 2015/07/17
- Re: never use `eval', Pascal J. Bourguignon, 2015/07/17
- Message not available
- Re: never use `eval', Pascal J. Bourguignon, 2015/07/15
- Re: never use `eval', Emanuel Berg, 2015/07/15