optimize isEmptyDeep

[drzhbe]

TL;DR isEmptyDeep is now 300 times faster

Function isEmptyDeep suffered from 2 problems:

1. Unnecessary memory allocations
2. No early return

And since it's used in the snapping code, whenever you have many or just big geometries, the geometry editing is janky.

In this PR I optimized the isEmptyDeep function and added the tests for it.

Video explanation:
https://www.loom.com/share/e70379b76e5141d984e773b70dd47921

Benchmark:
https://jsbench.me/h8l8dv6d7h/2

[Falke-Design]

Wow that is great! Thank you!

Please add a few more tests like requested and then I think we can merge this

[drzhbe]

@Falke-Design I've added the requested tests and made === undefined && === null explicit
The tests look pretty tidy to me, wdyt?

[Falke-Design]

This is really a nice improvement! Thank you very much!

@codeofsumit will make merge before the next release

[drzhbe]

@Falke-Design Thank you for the review! Do you know when approximately next release is gonna happen? Is it weeks/months away?

[Falke-Design]

Maybe with the end of oktober. I need first to fix most of the bugs but currently I have not much time

[drzhbe]

@Falke-Design I simplified the function a bit, removed the inner function hasValues. Now isEmptyDeep itself is recursive.

[Falke-Design]

I'm thinking about, if we should rename the function to hasValues, it would make it easier to understand the code in the function. Or does it not matter? What do you @drzhbe think?

[drzhbe]

@Falke-Design I agree the function reads a bit more straightforward now. And the name is shorter. Good suggestion 👍

[codeofsumit]

Amazing !!