jurStv

/*
 Here are five different implementations of the same floorSqrt() 
functional composition.
 They seem to be identical, but they deserve scrutiny.
 But there are a few key differences we should go over:
 Obviously the first method is verbose and inefficient.
 The second method is a nice one-liner, but this approach becomes very unreadable
after only a few functions are applied.
 The third approach is a chain of array functions, notably the map function. This works
fairly well, but it is not mathematically correct.