updateData clarification: how to "add or update"

[jakswa]

I'm updating a couple hundred Features on a map, and thought I'd try to use updateData to more efficiently pass in the current list of Features and update things. But:

• add works fine but reads like it will create a new Feature -- I was hoping to update in-place
• update will not add new entries in the list
• removeAll overrides the above and seems to clear my map, even if add is set

I see this method is newer, being added in 2022 -- am I thinking about it right? Is there a good place to clear up my thinking that I'm missing.

[HarelM]

Can you clarify the question? It is not clear if this is a general question about the diff object or something else.
The docs around this method and types is very elaborate I believe, I just read it now.

[jakswa]

Does "add" update in-place if the ID already exists?

[jakswa]

I guess the question now is: is there much difference between setData and updateData(add: ...), if you are passing the complete list in (with lots of existing entries).

[HarelM]

If you are expecting the data to be fully updated there's no point in calling updateData. If you are only adding features then you don't need to pass the existing ones, which can reduce some communication overhead.

[jakswa]

Thank you. I'll figure it out, and maybe read more source code. In my tests, "add" behaves like "add or update" since it does not create duplicates when the ID exists. "Add" can be an updater 🤙

[jakswa]

You can also pass the same data to "add" repeatedly and be ok. It can do nothing. I bet I should've stuck with setData 😅. I will give updateData(add: ...) the list for now, in the hope that it might be saving something.

Thank you again! I'll try to summarize this thread up top at some point, and mark this solved.