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RE: [External] : Re: Which Elisp types are mutable?
From: |
Drew Adams |
Subject: |
RE: [External] : Re: Which Elisp types are mutable? |
Date: |
Mon, 5 Jul 2021 20:39:54 +0000 |
> Hm. If you change a variable's value... does that count
> as "mutating the symbol"? If you change the binding (e.g.
> by entering another scope or by leaving it)?
(Changing a symbol's binding, with `let' etc.
is more complicated. I mentioned global value.)
If you look at a Lisp symbol as being an object
with properties, then yes; changing its variable
value changes the object - its mutable state.
There's nothing very special involved here. It's
just that people unused to Lisp won't necessarily
think that a symbol is a complex thing, and that
it "owns" its value as a variable (and its value
as a function, which for a Lisp-2 is separate).
The symbol is not its name. In many languages
you have only to think about a name and its
binding to a value. At a lower level you think
of a memory location (address) and the value at
that address.
In Lisp a source-code name can refer to a symbol
object. That object itself has other things /
properties, besides a value as a variable.
- Re: Which Elisp types are mutable?, (continued)
Re: Which Elisp types are mutable?, Philipp, 2021/07/05
- Re: Which Elisp types are mutable?, Eli Zaretskii, 2021/07/05
- Re: Which Elisp types are mutable?, tomas, 2021/07/05
- RE: [External] : Re: Which Elisp types are mutable?, Drew Adams, 2021/07/05
- Re: [External] : Re: Which Elisp types are mutable?, address@hidden, 2021/07/05
- RE: [External] : Re: Which Elisp types are mutable?, Drew Adams, 2021/07/05
- Re: [External] : Re: Which Elisp types are mutable?, address@hidden, 2021/07/05
- RE: [External] : Re: Which Elisp types are mutable?,
Drew Adams <=
- Re: [External] : Re: Which Elisp types are mutable?, Emanuel Berg, 2021/07/05