Earlier in the chapter, we learned that FP reduces the number of places in which state changes take place within an application and tries to move these places into the boundaries of the application to try to keep application's core stateless.
React and MobX are two popular open source libraries that can be used to build user interfaces. These libraries are highly influenced by FP and try to prevent state mutations by using pure functions and immutable objects (powered by libraries such as Immutable.js). However, state mutations must take place at some point. That is the main role of MobX, a library that allows us to manage the state in a React application.
In a MobX application, a new state should only be generated within one ...
