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`let' vs `let*' (was: Re: How do I pass a variable defined in a wrapping
From: |
Emanuel Berg |
Subject: |
`let' vs `let*' (was: Re: How do I pass a variable defined in a wrapping let, to a lambda?) |
Date: |
Mon, 14 Mar 2022 14:57:14 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) |
Jean Louis wrote:
> New `dlet' is this and it broke my programs because somebody
> removed `let*' inside. I don't think that person who changed
> it every used `dlet' in their own programs. Reason is
> semantics, "dlet" uses "let*" so they changed it, but did
> not provide "dlet*" (though is easy to adapt it).
Okay, well, I'm not a `dlet' user myself since dynamic/special
scope isn't in my programmer's DNA ...
As for `let' vs `let*' in theory `let' is parallel and `let*'
sequential but in practice `let*' allows references back to
its own bindings, so it is recursive `let' if you will, and
`let' isn't ...
I have seen examples where `let' doesn't behave the same way
as `let*' and this is by design, those examples felt to
a large extent artificial to me tho.
I don't know, would it be a good idea to just have `let' and
that would then be the same as today's `let*'? One could keep
a `let*' alias to `let' to avoid breaking code ...
--
underground experts united
https://dataswamp.org/~incal
- Re: How do I pass a variable defined in a wrapping let, to a lambda?, (continued)
- Re: How do I pass a variable defined in a wrapping let, to a lambda?, Eric Abrahamsen, 2022/03/11
- Re: How do I pass a variable defined in a wrapping let, to a lambda?, Michael Heerdegen, 2022/03/11
- Re: How do I pass a variable defined in a wrapping let, to a lambda?, Eric Abrahamsen, 2022/03/11
- Re: How do I pass a variable defined in a wrapping let, to a lambda?, Emanuel Berg, 2022/03/11
- Re: How do I pass a variable defined in a wrapping let, to a lambda?, Jean Louis, 2022/03/12
- `let' vs `let*' (was: Re: How do I pass a variable defined in a wrapping let, to a lambda?),
Emanuel Berg <=
- Re: `let' vs `let*' (was: Re: How do I pass a variable defined in a wrapping let, to a lambda?), Jean Louis, 2022/03/15
- Re: `let' vs `let*' (was: Re: How do I pass a variable defined in a wrapping let, to a lambda?), Emanuel Berg, 2022/03/15
- RE: [External] : `let' vs `let*' (was: Re: How do I pass a variable defined in a wrapping let, to a lambda?), Drew Adams, 2022/03/15
- Re: [External] : `let' vs `let*' (was: Re: How do I pass a variable defined in a wrapping let, to a lambda?), tomas, 2022/03/15
- Re: [External] : `let' vs `let*', Stefan Monnier, 2022/03/15
- Re: [External] : `let' vs `let*' (was: Re: How do I pass a variable defined in a wrapping let, to a lambda?), Emanuel Berg, 2022/03/15
- Re: [External] : `let' vs `let*' (was: Re: How do I pass a variable defined in a wrapping let, to a lambda?), Emanuel Berg, 2022/03/15
- Re: How do I pass a variable defined in a wrapping let, to a lambda?, Emanuel Berg, 2022/03/14
Re: How do I pass a variable defined in a wrapping let, to a lambda?, Emanuel Berg, 2022/03/11