Redux combineReducers example » grokonez

https://grokonez.com/frontend/redux/redux-combinereducers-example

Redux combineReducers example

From Redux Introduction, we know that there is only a single Store in a Redux application. When we want to split data-handling logic, we will combine Reducers instead of using many Stores. This tutorial shows you way to use Redux combineReducers() function in a Redux example.

Full example with filtering and sorting: Redux Reducer example - filter & sort data

Overview

combineReducers

If we have state whose values seem to correspond to different reducing functions like this:

const demoState = {
    books: [
        {
            id: '123abcdefghiklmn',
            title: 'Origin',
            description: 'Origin thrusts Robert Langdon into ...',
            author: 'Dan Brown',
            published: 2017
        },
        {
            ...
        }
    ],
    filters: {
        text: 'ori',
        sortBy: 'published',
        startYear: undefined,
        endYear: undefined
    }
};
We won't use only one Reducer to handle Action logic but two Reducers: one for books, and one for filters. Now, combineReducers() comes to be the solution. It combines 2 reducing functions into a single reducing function that can be passed to createStore():

const rootReducer = combineReducers({
    books: booksReducer,
    filters: filtersReducer
})

const store = createStore(rootReducer);

combineReducers rules

The Reducer that is passed to combineReducers() function must satisfy these rules: - For unrecognized Action: return the given state as the first argument. (we usually return state in default case of switch statement) - Never return undefined. - If the given state is undefined: return the initial state. So the initial state must not be undefined either.

Example Description

We will create a Redux Application that has: - state that contains 2 components: books array and filters. - 3 types of Actions: + 'ADD_BOOK', 'REMOVE_BOOK' for books. + 'FILTER_TEXT' for filters. - 2 child Reducers (booksReducer and filtersReducer) that will be combined using combineReducers() function.

We can add/remove books to/from books, set filters.text value.

Practice

Setup environment

In package.json:

More at:

https://grokonez.com/frontend/redux/redux-combinereducers-example

Redux combineReducers example

#redux #combinereducers #react

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Redux combineReducers example » grokonez

Redux combineReducers example » grokonez

https://grokonez.com/frontend/redux/redux-combinereducers-example

Redux combineReducers example

From Redux Introduction, we know that there is only a single Store in a Redux application. When we want to split data-handling logic, we will combine Reducers instead of using many Stores. This tutorial shows you way to use Redux combineReducers() function in a Redux example.

Full example with filtering and sorting: Redux Reducer example - filter & sort data

Overview

combineReducers

If we have state whose values seem to correspond to different reducing functions like this:

const demoState = {
    books: [
        {
            id: '123abcdefghiklmn',
            title: 'Origin',
            description: 'Origin thrusts Robert Langdon into ...',
            author: 'Dan Brown',
            published: 2017
        },
        {
            ...
        }
    ],
    filters: {
        text: 'ori',
        sortBy: 'published',
        startYear: undefined,
        endYear: undefined
    }
};
We won't use only one Reducer to handle Action logic but two Reducers: one for books, and one for filters. Now, combineReducers() comes to be the solution. It combines 2 reducing functions into a single reducing function that can be passed to createStore():

const rootReducer = combineReducers({
    books: booksReducer,
    filters: filtersReducer
})

const store = createStore(rootReducer);

combineReducers rules

The Reducer that is passed to combineReducers() function must satisfy these rules: - For unrecognized Action: return the given state as the first argument. (we usually return state in default case of switch statement) - Never return undefined. - If the given state is undefined: return the initial state. So the initial state must not be undefined either.

Example Description

We will create a Redux Application that has: - state that contains 2 components: books array and filters. - 3 types of Actions: + 'ADD_BOOK', 'REMOVE_BOOK' for books. + 'FILTER_TEXT' for filters. - 2 child Reducers (booksReducer and filtersReducer) that will be combined using combineReducers() function.

We can add/remove books to/from books, set filters.text value.

Practice

Setup environment

In package.json:

More at:

https://grokonez.com/frontend/redux/redux-combinereducers-example

Redux combineReducers example

#redux #combinereducers #react

Redux combineReducers example » grokonez

https://grokonez.com/frontend/redux/redux-combinereducers-example

Redux combineReducers example

From Redux Introduction, we know that there is only a single Store in a Redux application. When we want to split data-handling logic, we will combine Reducers instead of using many Stores. This tutorial shows you way to use Redux combineReducers() function in a Redux example.

Full example with filtering and sorting: Redux Reducer example - filter & sort data

Overview

combineReducers

If we have state whose values seem to correspond to different reducing functions like this:

const demoState = {
    books: [
        {
            id: '123abcdefghiklmn',
            title: 'Origin',
            description: 'Origin thrusts Robert Langdon into ...',
            author: 'Dan Brown',
            published: 2017
        },
        {
            ...
        }
    ],
    filters: {
        text: 'ori',
        sortBy: 'published',
        startYear: undefined,
        endYear: undefined
    }
};
We won't use only one Reducer to handle Action logic but two Reducers: one for books, and one for filters. Now, combineReducers() comes to be the solution. It combines 2 reducing functions into a single reducing function that can be passed to createStore():

const rootReducer = combineReducers({
    books: booksReducer,
    filters: filtersReducer
})

const store = createStore(rootReducer);

combineReducers rules

The Reducer that is passed to combineReducers() function must satisfy these rules: - For unrecognized Action: return the given state as the first argument. (we usually return state in default case of switch statement) - Never return undefined. - If the given state is undefined: return the initial state. So the initial state must not be undefined either.

Example Description

We will create a Redux Application that has: - state that contains 2 components: books array and filters. - 3 types of Actions: + 'ADD_BOOK', 'REMOVE_BOOK' for books. + 'FILTER_TEXT' for filters. - 2 child Reducers (booksReducer and filtersReducer) that will be combined using combineReducers() function.

We can add/remove books to/from books, set filters.text value.

Practice

Setup environment

In package.json:

More at:

https://grokonez.com/frontend/redux/redux-combinereducers-example

Redux combineReducers example

#redux #combinereducers

Get Param from Url & create Edit Item Form - react-redux example » grokonez

https://grokonez.com/frontend/react/get-param-from-url-edit-item-form-react-redux-example

Get Param from Url & create Edit Item Form – react-redux example

We have built a React Application that connects with Redux, then filter with input text and sort list of items. We also created Form for adding new item. In this tutorial, we’re gonna use that form to edit and update item with id param getting from Url using react-redux and React Router v4.

Example Overview

When clicking on any item, the app will bring us to a Form (like add item form). Now we can edit item and click on Add Book button, the list of Book items will be updated immediately. edit-item-form-react-redux-example-goal

How to Get Param from Url & create Edit Item Form

Context

Remember that our App state is like this:

const demoState = {
    books: [
        {
            id: '123abcdefghiklmn',
            title: 'Origin',
            description: 'Origin thrusts Robert Langdon into the dangerous intersection of humankind’s two most enduring questions.',
            author: 'Dan Brown',
            published: 2017
        }
    ],
    filters: {
        text: 'ori',
        sortBy: 'published', // published or title
        startYear: undefined,
        endYear: undefined
    }
};
We have had BookForm Component that has its own state for Book fields and onSubmit() method:

More at:

https://grokonez.com/frontend/react/get-param-from-url-edit-item-form-react-redux-example

Get Param from Url & create Edit Item Form – react-redux example

#react #redux #example

Learn React, Redux and Typescript in 2021 - Shopping Cart Example - Redux Basics #2

Hello! In this series we will learn how to use Redux to manage the state of your app. We will use TypeScript and ReactJS to build simple shopping cart app. My aim is to explain how you can build app with Redux in 2021 with the latest and the best patterns. We will use hooks and slices as our approach to build our store and connect Redux to our ReactJS app.

In the second episode we will discuss Redux basics, create our store, link it to ReactJS and write our first Redux slice.

▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬
0:00 - Theoretical Intro to Redux
8:48 - Creating Redux store
10:22 - Adding Redux to ReactJS
12:50 - Creating our first Redux slice
18:30 - Connecting React component to Redux store with useSelector

You can find me here:

https://twitter.com/wojciech_bilick
https://medium.com/@wojciech.bilicki
https://github.com/wojciech-bilicki


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#react #redux #typescript #redux

Reduce Redux Boilerplate Code with Redux-Actions

Redux has become one of the most popular libraries in front-end development since it was introduced by Dan Abramov and Andrew Clark in 2015. They designed it as the successor for Flux, with the support of some developer tools and a few more concepts embedded in it.

Flux is a fancy name for observer pattern further modified to support React. Both Flux and Redux consist of similar concepts like Store, Actions (events in the application). In other words, Flux is a simple JavaScript object but with some middleware like redux-thunk. It can be a function or a promise for Redux. However, Redux is a single source of truth with concepts like immutability, which improve performance. It is one of the main reasons for Redux to dominate in State Management.

Image for post

Flux vs Redux comparison source: enappd.com

Despite its advantages, some developers have found it rather challenging to deal with Redux due to the amount of boilerplate code introduced with it. And the complexity of the code seems to be another reason for the difficulty.

In this article, we will look at how to reduce the boilerplate code brought about by Actions and Reducers using Redux-Actions

#react-redux-boilerplate #react-redux #react #react-actions #redux