DOM API: How get last child efficiently?

[Jean-Luc-Picard-2021]

I find this DOM API:

parent_of( +htmlObject, ?htmlObject )
parent_of( ?htmlObject, +htmlObject )
http://tau-prolog.org/documentation/prolog/dom/parent_of/2

But I guess the mode (-,+) doesn't provide an efficient way
to get the last child. On the other hand in JavaScript I can simply call:

    return at.lastElementChild;

What is the recommended way to do this in Tau Prolog?

[Jean-Luc-Picard-2021]

Ha Ha ChatGPT is trolling me. You can search last_child
in Tau Prolog current GitHub, not a single find.

https://github.com/tau-prolog/tau-prolog/search?q=last_child

Or try this:

:- use_module(library(dom)).
?- last_child(foo, bar).
uncaught exception: error(existence_error(procedure,last_child/2),top_level/0)

Nevertheless ChatGPT halucinates something perfectly plausible:

Q: How get DOM last child in Tau Prolog programming language.

A: In Tau Prolog, you can use the built-in predicate
"last_child/2" to get the last child of a DOM element.

The predicate takes two arguments:

The DOM element for which you want to get
the last child (the parent element)
A variable that will be bound to the last child element

Example usage:

Copy code
last_child(parent_element, LastChild),
You have to unify the parent element with a variable
that has been initialized as a DOM element .

Please note that my knowledge cut off on Tau-Prolog is
from 2021 and this predicates could be deprecated or
changed so I recommend to check in the documentation
of the library you're using or check the version of
Tau-Prolog you're working with.

LoL