Wicked Cool Java

Funkier Functors: Using Composite Functors

In the previous section, we used functors to filter the input to a for loop, thereby removing any need for filtering code in our processing loop. JGA has utilities for creating composite functors , and they are automatically built into every unary and binary functor. A UnaryFunctor has a compose method that returns a new functor that is a composition of an inner functor. When you see the compose method, think about the word of: f.compose(g) is like saying "f of g." In other words, you can create a functor ...