#reduxjs

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Contemporary ReduxJS ( Redux Toolkit )

Contemporary ReduxJS ( Redux Toolkit )

 Derive The Course   Label: 104,99 $ Contemporary ReduxJS ( Redux Toolkit ) kursuna hoşgeldiniz. React son beş yılın en popüler Javascript kitaplığı ve iş piyasası hala her zamankinden daha sıcak. Hatta birçok insan bundan net geliştirmenin geleceği olarak bahsediyor. 1,300’den fazla geliştiricinin ve 94,000 ‘den fazla sitenin ReactJS kullandığı tahmin edilmekte. Büyük ve küçük şirketler React…

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“React with Redux - TPS4OPT For more details 📞 [phone] Visit 🌐 https://t.co/S3f92HzYzh #redux #reactjs #javascript #react #programming #html #CSS @reduxjs @reactjs”

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Configuring eslint for the React JS project help you save extra time by auto detecting syntax error. Moreover you can enforce coding standard and convention from these setting. There are lots of tutorial for simple setup but in this article I have shown a must complete way.

[nthchildconsulting-blog]

Redux Testing

Redux testing is essential in order to keep your store reliable and understandable. The great thing about Redux is that it is framework agnostic and writing tests for it is really easy.

Actions

Here are the actions we can perform.

export const INCREMENT = 'INCREMENT'; export const DECREMENT = 'DECREMENT'; export const ADD_COUNTER = 'ADD_COUNTER'; export const REMOVE_COUNTER = 'REMOVE_COUNTER';

Reducer

Let's start with a simple reducer for counters.

import * as types from '../constants/ActionTypes'; const CountersReducer = (state = [0], action) => { switch (action.type) { case types.INCREMENT: return [ ...state.slice(0, action.index), state[action.index] + 1, ...state.slice(action.index + 1), ]; case types.DECREMENT: return [ ...state.slice(0, action.index), state[action.index] - 1, ...state.slice(action.index + 1), ]; case types.ADD_COUNTER: return [...state, 0]; case types.REMOVE_COUNTER: return [ ...state.slice(0, action.index), ...state.slice(action.index + 1), ]; default: return state; } }; export default CountersReducer;

This reducer has four actions that be performed. It can increment or decrement a single counter, and it can remove counters from the state.

Tests

Now for the testing of this reducer.

import CountersReducer from '../CountersReducer'; import * as types from '../../constants/ActionTypes'; import deepFreeze from 'deep-freeze'; describe('Counters Reducer', () => { it('should return the initial state', () => { expect(CountersReducer(undefined, {})).toEqual([0]); }); it('should increment the counter', () => { const beforeState = [0]; const afterState = [1]; const action = { type: types.INCREMENT, index: 0 }; deepFreeze(beforeState); expect(CountersReducer(beforeState, action)).toEqual(afterState); }); it('should decrement the counter', () => { const beforeState = [0]; const afterState = [-1]; const action = { type: types.DECREMENT, index: 0 }; deepFreeze(beforeState); expect(CountersReducer(beforeState, action)).toEqual(afterState); }); it('should add a counter', () => { const beforeState = [0]; const afterState = [0, 0]; const action = { type: types.ADD_COUNTER }; deepFreeze(beforeState); expect(CountersReducer(beforeState, action)).toEqual(afterState); }); it('should remove a counter', () => { const beforeState = [0, 0]; const afterState = [0]; const index = 0; const action = { type: types.REMOVE_COUNTER, index }; deepFreeze(beforeState); expect(CountersReducer(beforeState, action)).toEqual(afterState); }); });

The first test begins with testing the initial state of the reducer. In this case we start with one counter with a default value of 0.

The next tests increments the first counter by one and after that decrements the first counter.

Then the final tests add and remove a counter.

Conclusion

Testing Redux is fairly simple and straightforward. There are some more complex situations and asynchronous behavior that might get tricky, but in the end your app with thank you.

[nthchildconsulting-blog]

Redux Todos

Redux is a state manager for Javascript. You can use these patterns to store your state in any Javascript project not just React. It will help you write consistent behavior running in different environments. You can learn more about redux at:

https://redux.js.org/

We will be building the Todos store based on the tutorial from the Redux website and including it in our React Material UI Todos app. Here are the links to the tutorial and full code base.

https://redux.js.org/basics

https://gitlab.com/nthchildconsulting/material-ui-todos

Redux

First we will create a folder called redux in the src directory of our app. This way we can keep everything self contained.

Constants

I like to create a folder called constants that will hold all of our constants we need throughout our store. Within that folder create a file called ActionTypes.js that will describe what kind of actions we can perform on our store.

src/redux/constants/ActionTypes.js

export const ADD_TODO = 'ADD_TODO'; export const TOGGLE_TODO = 'TOGGLE_TODO'; export const SET_VISIBILITY_FILTER = 'SET_VISIBILITY_FILTER';

You can see that we will perform three simple actions. One to create a todo, toggle a todo complete, and setting the visibility of what todos have been completed or not.

Actions

Now we will create a folder called actions that will hold all of the actions that we will perform in our store.

src/redux/actions/TodosActions.js

import * as types from '../constants/ActionTypes'; let nextTodoId = 0; export const addTodo = text => ({ type: types.ADD_TODO, id: nextTodoId++, text, }); export const setVisibilityFilter = filter => ({ type: types.SET_VISIBILITY_FILTER, filter, }); export const toggleTodo = id => ({ type: types.TOGGLE_TODO, id, }); export const VisibilityFilters = { SHOW_ALL: 'SHOW_ALL', SHOW_COMPLETED: 'SOME_COMPLETED', SHOW_ACTIVE: 'SHOW_ACTIVE', };

Within the reducer of Redux it will expect a type and any other data needed to perform the action. In this file we setup the data structure that will be sent into the reducer. We have three functions, addTodo, toggleTodo, and setVisibilityFilter. You will be able to use these functions within your app.

Reducers

Reducers are where the implementations of the actions happen. Create a folder called reducers. We will add two reducers to the folder.

src/redux/reducers/TodosReducer.js

import * as types from '../constants/ActionTypes'; const TodosReducer = (state = [], action) => { switch (action.type) { case types.ADD_TODO: return [ ...state, { id: action.id, text: action.text, completed: false, }, ]; case types.TOGGLE_TODO: return state.map(todo => { return todo.id === action.id ? { ...todo, completed: !todo.completed } : todo; }); default: return state; } }; export default TodosReducer;

You can see from the code that we are checking the type of action and returning a brand new state based on the action. When we call addTodo it will create a new todo object and put it on the state. If we call toggleTodo it will map through all the todos and toggle the one we clicked on.

src/redux/reducers/VisibilityFilterReducer.js

import { VisibilityFilters } from '../actions/TodosActions'; import * as types from '../constants/ActionTypes'; const VisibilityFilterReducer = ( state = VisibilityFilters.SHOW_ALL, action ) => { switch (action.type) { case types.SET_VISIBILITY_FILTER: return action.filter; default: return state; } }; export default VisibilityFilterReducer;

This reducer will handle the setVisibilityFilter action and just set what will be visible in our todos.

Now lets combine both of our reducers to use in our main store.

src/redux/reducers/index.js

import { combineReducers } from 'redux'; import TodosReducer from './TodosReducer'; import VisibilityFilterReducer from './VisibilityFilterReducer'; export default combineReducers({ todos: TodosReducer, visibilityFilter: VisibilityFilterReducer, });

src/redux/store.js

import { applyMiddleware, createStore } from 'redux'; import logger from 'redux-logger'; import thunkMiddleware from 'redux-thunk'; import reducers from './reducers'; export default createStore(reducers, applyMiddleware(thunkMiddleware, logger));

Now we can add in the store into our React app, or whatever app you need to.

src/index.js

import React from 'react'; import App from './containers/App/App'; import { render } from 'react-dom'; import registerServiceWorker from './registerServiceWorker'; import './index.css'; import { Provider } from 'react-redux'; import store from './redux/store'; const rootElement = document.getElementById('root'); render( <Provider store={store}> <App /> </Provider>, rootElement ); registerServiceWorker();

We have setup in our React app to use a Provider with our redux store. We can then dispatch actions to the store. Here is an example of adding a todo.

src/containers/AddTodo/AddTodo.js

import React, { Component } from 'react'; import PropTypes from 'prop-types'; import { connect } from 'react-redux'; import { addTodo } from '../../redux/actions/TodosActions'; import Input from '@material-ui/core/Input'; import Button from '@material-ui/core/Button'; import AddIcon from '@material-ui/icons/Add'; import { withStyles } from '@material-ui/core/styles'; import Grid from '@material-ui/core/Grid'; const styles = theme => ({ button: { [theme.breakpoints.down('xs')]: { width: '35px', height: '35px', }, }, }); class AddTodo extends Component { state = { todo: '', }; handleChange = event => { this.setState({ todo: event.target.value }); }; handleClick = () => { if (!this.state.todo.trim()) { return; } this.props.dispatch(addTodo(this.state.todo)); this.setState({ todo: '' }); }; render() { const { classes } = this.props; return ( <div> <Grid container spacing={24} justify="center"> <Grid item xs={10} sm={10}> <Input fullWidth placeholder="What will you do next?" value={this.state.todo} onChange={this.handleChange} onKeyPress={e => { if (e.key === 'Enter') { e.preventDefault(); this.handleClick(); } }} /> </Grid> <Grid item xs={2}> <Button variant="fab" color="primary" aria-label="add" className={classes.button} onClick={this.handleClick} > <AddIcon /> </Button> </Grid> </Grid> </div> ); } } AddTodo.propTypes = { classes: PropTypes.object.isRequired, }; export default connect()(withStyles(styles)(AddTodo));

We can use the redux connect to add the store to our props. When we click on the button to add a todo it will call the handleClick event and dispatch our addTodo action.

Conclusion

There is a bit of boilerplate when using Redux but you can explicitly set up all your actions and easily test all the of functionality of your app. Once you have all your actions coded all you need to do is provide your app with the Redux store and it will be available to all your components.