> No, not exactly. It looks like I need to be more explicit, here goes: Remember, an arrow function's BODY shares the same scope with its parent function

Exactly like a non-arrow function, then?

I don’t mind if you don’t have the energy to support your claim, but I will recommend that you don’t make claims like “arrow functions are slower” if you can’t back them up properly or even provide any detail.

I also get the impression that you don’t know how arrow functions actually differ from non-arrow functions (see above), so your anecdote that you couldn’t figure out the bug doesn’t make a strong case.

> Do you have any evidence that you do not use it?

My browser was crashing for no apparent reason and stopping voting on HN solved it.