Re: [External] : Re: Lexical vs. dynamic: small examples?

[Emanuel Berg]

Stefan Monnier via Users list for the GNU Emacs text editor wrote:

>> "Dynamic" is something that changes over time, but TBH
>> I don't really see the static/dynamic aspect or
>> difference here?
>
> This use of the term is the same as used in code analysis.
> "static" refers to the fact that you can find the definition
> corresponding to a particular use by just looking at the
> code without having "run" it.
>
> In contrast "dynamic" refers to the fact that in order to
> find which definition corresponds to a particular use can
> only be done you need to run the code (or simulate a run,
> typically in your head).
>
> It can also be considered from the following point of view:
> with lexical/static scoping, a given variable reference will
> always refer to the same definition point, i.e.
> the "use-to-def" doesn't change and is hence "static",
> whereas with dynamic scoping, a given variable reference can
> refer to various definitions at different moments of
> a program execution, i.e. the "use-to-def" can change and is
> hence dynamic.

Great, thanks!

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