The decorator pattern is a well known one, where one "decorates" a function by passing it into another function. GP expresses that they would avoid the pattern with these decorators.
The decorator operator is essentially prefix notation of the form `f1 = f2(f1) = @ f2 f1` which is what the GP alluded to, i.e. that f2 is a higher order function since it takes a function and produces another function. In-fact, the @ operator is a higher order function as well since it takes 2 higher order functions.
The decorator pattern is a well known one, where one "decorates" a function by passing it into another function. GP expresses that they would avoid the pattern with these decorators.
The decorator operator is essentially prefix notation of the form `f1 = f2(f1) = @ f2 f1` which is what the GP alluded to, i.e. that f2 is a higher order function since it takes a function and produces another function. In-fact, the @ operator is a higher order function as well since it takes 2 higher order functions.