Check out a free preview of the full Reactive Angular 2 course:
The "Reducers" Lesson is part of the full, Reactive Angular 2 course featured in this preview video. Here's what you'd learn in this lesson:
A reducer is a method that takes in the current state and an action. Based on the action, the reducer will return a new state. Reducers and their initial state are registered in the application with provideStore. After talking about reducers, Lukas demonstrates how the store.select() and store.dispatch() methods are used. Then he takes questions from students.