Single source of truth
Redux consists of a single store, which is a JavaScript value containing the entire state of your application. A single source of truth comes with a lot of benefits:
In traditional applications, the state is stored in different places across the whole application. With a single source of truth, debugging becomes easy, as you simply have one value to look at.
It is easy to create universal apps, as you can serialize the application state on the server and send it to the client without much effort.
Generalized functionalities, such as undo/redo, become easy to implement. For example, you can simply drop in a library that turns (a part of) your state into an undoable state.
To access the application state, Redux provides a .getState() function on the store object. You can view the full state, as follows:
console.log(store.getState())
The output of the preceding code will be the application state. In our example application, the output would be the post array we defined earlier:
[
{ user: 'dan', text: 'Hello World!' },
{ user: 'des', text: 'Welcome to the blog' }
]