Interface

n Python, unlike some other programming languages, there is no explicit syntax for defining interfaces.

The utility package java.util.function has this functional interface Consumer. Each functional interface (Annotated with @FunctionalInterface) conceptually has a single method (abstract) called the functional method to which the lambda expression’s parameter and return types are matched against. Functional interfaces often represent abstract concepts like functions, actions, or predicates.

An interface in Golang is a set of methods and a type.