[Redux] Supplying the Initial state

We'll learn how to start a Redux app with a previously persisted state, and how it merges with the initial state specifi Ed by the reducers.

The initial state of store was defined by the Rootreducers:

Const TODOAPP = combinereducers ({  todos,  visibilityfilter,});

And we use the ' Todoapp ' to create store:

Const STORE = createstore (Todoapp);

So the initial state should is default value of each reducer ' s state:

Const TODOS = (state = [], action) += (state = ' show_all ', action) = {...

If we want to show some persosted data as initial state, we can pass the persisted data as a second args to ' CreateStore () ' Function:

Const Persistedstate = {  todos: [    {      0,      "Redux",      false     }   = CreateStore (Todoapp, persistedstate);

So the rules is:

• If there is persisted data want to display, use this second args, otherwise use ES6 default param
• Once persisted data is passed in, it would overwrite the default params.

[Redux] Supplying the Initial state