simple example about using React && Redux

• <Provider /> is the higher-order component provided by React Redux that lets you bind Redux to React, need to be imported import { Provider } from 'react-redux';.

• createStore(reducer, [preloadedState], [enhancer]) Creates a Redux store that holds the complete state tree of your app, there should only be a single store in your app, need to be imported import { createStore } from 'redux';.

• dispatch(action) Dispatches an action. This is the only way to trigger a state change.

• getState() Returns the current state tree of your application. It is equal to the last value returned by the store's reducer.

• subscribe(listener) Adds a change listener. It will be called any time an action is dispatched, and some part of the state tree may potentially have changed.

combineReducers(reducers) it turns an object whose values are different reducing functions into a single reducing function , the resulting reducer calls every child reducer, and gathers their results into a single state object, need to be imported import { combineReducers } from 'redux';.

• mapStateToProps() specify exactly which slice of the state we want to provide to our component.

• mapDispatchToProps() specify exactly which slice of the Action we want to provide to our component.

• connect([mapStateToProps], [mapDispatchToProps], [mergeProps], [options]) Creates a higher-order component for making container components out of base React components, need to be imported import {connect} from 'react-redux';