chatgpt (not to be offensive)

Short n clear!

I think a best practice is to always use a Named function instead of an Arrow function for easy error location and handling.

Needs a test case where the difference of the distance calculated from two phones is greater than 1000 meters (there is only a test for when their sum is less than 1000 meters).

oh, ok. thanks for answering

For fun.

why replace function with a constant?

spoiler flag please! :/

Cool solution! Deserves more clever points, IMHO

I'm not sure if it can be considered as cheating.

no

This solution is actually fast. I ran double(30, 20000) for the above solution and my solution without the "if b > 0.00000000001" part. my solution took 565ms wheras above solution took 165ms.same code but way faster.