How does it work? why you can just swap base and power and it still works?

You've wrote a great elegant solution but it's very unclear. I spend half a day to understand what your code actually does. It is the case where comments are absolutely necessary

why square root?

checking for empty string.

empty string is boolean False so when s exists (== True) Python returns this expression:

s[0] + s.title().translate(None, "-_")[1:]

otherwise it returns s which is ""

I solve this years ago, and I use python2 at that time.

stupid technical requirement

here as A we recieve function (b=>....)
later we call that function a(1) and it recieves as b "1" (1=>...)
also we call this function a(2) and it recieves as b "2" (2=>....)
we get first item of arrays of both functions and doing Math
Hope it helps )

explain this please (a=>a(1)[0]**2*a(2)[0])

why this doesn't work :
while ( ( xsSymbol.iterator.next() ) && !found ) {......}

why have we to use variable iterator to store xs[Symbol.iterator]() ?