A Complete Guide to React Redux for Beginners
React Redux: As the name implies, it is a Facebook-created javascript library that is the most widely used javascript library for creating user interfaces (UI) for single-page apps. React js allows developers to break down complex user interfaces into simpler ones. We can make specific modifications to data in web apps without having to reload the page. React allows you to create components that may be reused.
Benefits of React.Js
Easy to understand and use:
React is simple to learn and use, and it comes with a variety of documentation, tutorials, and training materials. You can develop a web application with simple JavaScript and then manage it with this. In the MVC (Model View Controller) design, it's also known as the V.
CodeReability increases with JSX:
Javascript XML is shortened as JSX. This is a type of React file that combines javascript expressiveness with HTML-like template syntax. JSX simplifies and improves your code.
Virtual DOM
A memory-representation of Real DOM is Virtual DOM (Document Object Model). A virtual DOM is a small JavaScript object that is essentially a duplicate of the Real DOM.
It aids in performance, resulting in a quick rendering of the program.
Reusable components
Each component has its own logic and drawing control, and it may be reused wherever you need it. Component reusability simplifies the development of your application and improves performance.Due to these reasons react is so popular to build mobile applications so get the help from the best react agency .
Need for React Redux:
The core problem with React js is state Management.
There may be the same data to display in multiple places. Redux has a different approach, redux offers a solution storing all your application state in one place called store. The component then dispatches state changes to the store not directly to the component.
What is Redux?
Redux is a javascript application's predictable state container. It aids with the development of programs that act consistently, run in a variety of contexts, and are simple to test. Redux is mostly used to manage states.
Advantages of using Redux
Redux makes state predictable:
When the same state and action are sent to a reducer in redux, the state is predictable. It consistently produces the same outcome. due to the fact that reducers are pure functions The state is also immutable and unalterable. This allows us to perform difficult tasks like limitless redo and undo.
Ease of testing;
Redux apps can be easily tested since functions are used to change the state of pure functions.
Maintainability:
Redux is strict about how code should be organized, which makes understanding the structure of any redux application easier for someone with redux knowledge. This generally makes the maintenance easier.
Redux Data Flow
Redux is composed of the following components:
Action
Reducer
Store
View
Action: Actions are the information payloads that transfer data from your app to your store. Actions define what happens, but they don't indicate how the application state changes in the response.
Action must have a type property that indicates types of action being performed
they must be defined as a string constant.
Action-type:
export const ADD_ITEM=’ADD_ITEM,
Action-creator:
import * as actionType from ‘./action-types’
function addItem(item) {
return {
type: actionType.ADD_ITEM,
payload:item
}
}
Reducer: Reducer is a pure function which specifies how application state change in response to an action. Reducer handles action dispatch by the component. Reducer takes a previous state and action and returns a new state. Reducer does not manipulate the original state passed to them but makes their own copies and updates them.
function reducer(state = initialState, action) {
switch (action.type) {
case ‘ADD_ITEM’:
return Object.assign({}, state,
{ items: [ …state.items,
{
item: action.payload
}
]
})
default:
return state
}
}
Things you should never do inside a reducer
Mutate its arguments
Perform side effects like API calls
Calling non-pure functions Like Math.random()
Store
A store is an object that brings all components to work together. It calculates state changes and then notifies the root reducer about it. Store keeps the state of your whole application. It makes the development of large applications easier and faster. Store is accessible to each component
import { createStore } from ‘redux’
import todoApp from ‘./reducers’
let store = createStore(reducer);
View:
The only purpose of the view is to display the data passed by the store.
Conclusion:
As a result, the reason we should utilize React with Redux is because it solves the state management problem. Redux provides methods for keeping all of your application's state in a single location, or central store, that is accessible to all components.