Become a member
to unlock all features

Level Up!

Access all courses & lessons on egghead today and lock-in your price for life.


    Use a Maybe functor to halt transformer functions from acting on null or undefined values


    As its name suggests, a Maybe is a type that may or may not hold a value. In JavaScript, we can use Maybes to check whether a value is undefined or null prior to passing it through to a transformer function and ultimately give us better control over the flow of our

    In this lesson, we walk through the process of writing a factory function for creating objects that implement a Maybe functor. The overall goal of the lesson is to become more comfortable working with the functor data type while learning about Maybe, a widely-known implementation in the functional programming world