Functional Programming Patterns in Scala and Clojure

Pattern 1

Replacing Functional Interface

Intent

To encapsulate a bit of program logic so that it can be passed around, stored in data structures, and generally treated like any other first-class construct

Overview

Functional Interface is a basic object-oriented design pattern. It consists of an interface with a single method with a name like run, execute, perform, apply, or some other generic verb. Implementations of Functional Interface perform a single well-defined action, as any method should.

Functional Interface lets us call an object as if it were a function, which lets us pass verbs around our program rather than nouns. This turns the traditional object-oriented view of the world on its head a bit. In the strict object-oriented view, ...