Yes, see there

The previous one may also work with other types tho

tit("a", "b", "c") -> "abc"

I'm not a Python expert, does reduce pass exactly 2 arguments into fold func? In JS reduce folds also putting currentIndex and array args

No, but int.__add__ is a function so it allows other stuff (see this fork for example).

Cool

Does __add__ make any difference compared to +?

why do you sum the fonction name and not the two variable