He's probably referring to the passing of partially applied functions. I've never quite understood why you need `_` as well: you are already defining your funct

He's probably referring to the passing of partially applied functions. I've never quite understood why you need `_` as well: you are already defining your function with the strange Curry syntax (f(param1)(param2)), you shouldn't need to pass "f _" to tell the compiler that on top.