A common mistake when writing business logic in web apps is code duplication. If a component needs to fetch user data the first thing that comes to mind is fetching it in the componentDidMount hook. The problem with that is repeating the code in every component that needs the same data….

Source: https://blog.bitsrc.io/complex-app-logic-with-redux-and-redux-saga-write-an-authentication-monitor-2f5672303d7d