It's actually very common to pass around hashmaps of functions in dynamic languages. If anything, since you don't even have to know how they're implemented it's

It's actually very common to pass around hashmaps of functions in dynamic languages. If anything, since you don't even have to know how they're implemented it's easier. I realize that my function incurs a run time cost because I'm making an array of trait objects. When I'm writing JavaScript I don't know and I don't care.