Hands-On Design Patterns with React Native

Generic types

Generics allow you to write code that will handle any type of object. For instance, you know that a list is a generic type. You can make a list of anything. Hence, when we used Immutable.List, we had to specify what kind of objects the list will consist of:

Immutable.List<TaskType>

List of tasks. Let's now create our own generic type.

In our code base, we have one util that is supposed to work with any type. It is a Maybe monad.

If you have jumped to this chapter, then you may find it handy to read about monad patterns in Chapter 9, Elements of Functional Programming Patterns.

The Maybe monad is either Nothing, when the variable happens to be null, undefined, or Something of that type. This is a perfect fit for generic types: ...