Quick Redux Setup
By: Alexander Gabriel
Tags: Software Development, Software Engineering, React, Redux

Quick view of my directory

I’m going to explain Redux from the top and work my way as I pass it down in my app. Firstly, in my Redux, reducers folder I am adding in my reducer. It looks like so-

This is a Reducer

The only reason I am importing ADD_TAG and DELETE_TAG from my types folder is so that I can say ‘case ADD_TAG’ as a variable instead of ‘case ‘ADD_TAG’’ as a string. It helps a bit with management. My types simply looks like this -

export const ADD_TAG = "ADD_TAG" export const DELETE_TAG = "DELETE_TAG"

In the currentTags reducer (which is a function) we are setting up our initial state here. In my example is it an empty array. The second parameter is the action. In the function, we set up a switch-case statement. I have two, ADD_TAG and DELETE_TAG.

In my index.js in the reducers folder. I have this-

import { combineReducers } from 'redux'

import currentTags from './currentTags' export default combineReducers({

currentTags,

})

I am importing all my reducers here and then combining them into the combineReducers function. This is our “store” of state, essentially, all in one place.

In my index.js in my ‘store’ folder. I have this -

import { createStore } from 'redux'

import rootReducer from '../reducers' export default createStore(

rootReducer,

window.__REDUX_DEVTOOLS_EXTENSION__ && window.__REDUX_DEVTOOLS_EXTENSION__()

)

It is importing the combineReducers function because in the import statement it is automatically looking for the index.js file.

Now, in our main index.js file in the src folder, we need to wrap our App component in a Provider Component to pass our store down to it.

import React from 'react';

import ReactDOM from 'react-dom';

import './index.css';

import App from './App'; import reportWebVitals from './reportWebVitals';

import { Provider } from 'react-redux'

import store from './Redux/store' ReactDOM.render(

<React.StrictMode>

<Provider store={store}>

<App />

</Provider>

</React.StrictMode>, document.getElementById('root') );

Finally, in my components folder I have a post.js component. In this component I am importing useDispatch and useSelector from react-redux. I am also importing ADD_TAG and DELETE_TAG from my types, again, just to make them variables.

import React from 'react'

import { useEffect, useState } from 'react'

import { useDispatch, useSelector } from 'react-redux'

import { ADD_TAG, DELETE_TAG } from '../../Redux/types' function Post() { const [tag, setCharTag] = useState('') const dispatch = useDispatch()

const tags = useSelector(state => state.currentTags) function addTag(tag ) {

if (tags.length < 6){

dispatch({ type: ADD_TAG, payload: tag })

}

} function deleteTag(tag) {

dispatch({ type: DELETE_TAG, payload: tag })

} <IconButton onClick={() => addTag(tag)}>

<AddIcon />

</IconButton> }

In the above example, I have a hook to set different tags. I set useDispatch() to dispatch and I use useSelector to say I want to use my currentTags reducer to check the tags. In this case, when a user clicks the IconButton it will fire off the addTag function. If tags is less than 6 in length it will dispatch the tag with the type ADD_TAG to the reducer of currentTags. It will then go through the switch-case statements and and since it is the ADD_TAG type it will perform that function (which is to add the tag to state).

This is just the quick way to to setup Redux to your React application. I plan to add a more thorough explanation of Redux in future blog posts!