I don't quite see how Javascript pre-ES5 was any more of a functional language than, say, Ruby at the time (a notoriously OO language). "It uses prototypes, no

I don't quite see how Javascript pre-ES5 was any more of a functional language than, say, Ruby at the time (a notoriously OO language). "It uses prototypes, not classes!" simply makes it a different kind of object-oriented.