#7 - How React Work | Real DOM vs Virtual DOM | Coding Structure | Naming Convention
Categories - React Js Tags - React Js JavaScript   Maniruzzaman Akash   3 months ago   272   0

#7 - How React Work | Real DOM vs Virtual DOM | Coding Structure | Naming Convention

Today we'll discuss the topics -

  • How does React Work ?
  • How Real DOM Work
  • How Virtual DOM Works.
  • How Virtual DOM actually Work - Diff Algorithm.
  • Project Structure of React
  • Intro of JSX
  • Naming Convention of of React

 

Helper Links - 

 

DOM = Abstraction of a structured HTML Code.

Flow HTML Code > nodes > in Memory Representation.

Real DOM Code Example

var item = document.getElementById("myLI");
item.parentNode.removeChild(item);

 

To change Real DOM

  • Find every node interested on an event -> HTML DOM API
  • Update it if necessary -> Virtual DOM

 

Virtual DOM

Virtual DOM is Abstraction of the HTML DOM. 

  • Lightweight 
  • Detached from the browser-specific implementation details. 
  • An abstraction of an abstraction.

 

How Manage then this in Virtual DOM 

  • ReactElement Makes the Basic Nodes. Immutability

 

Example Using React Element

var root = React.createElement('div');
ReactDOM.render(root, document.getElementById('example'));

 

ReactComponent >> Replacement of ReactElement

JSX Compiled > HTML Tags

 

Main Process

  • React Component Change
  • Convert to React Element
  • React Element Insert to the Virtual DOM
  • Compare the Virtual DOM using Diff Algorithm only the specific part of the DOM changes.
  • When knowing the Diff
  • Convert it to low-level code
  • Execute on DOM
  • Browser Render

 

JSX

JavaScript Template Language, Can Use Full Features of JavaScript.

 

 

Naming Convention 

  • Class Name - Pascal Case - User, UserReducer, LoginAction, AuthAction, AuthService
  • Variable - CamelCase - const userList = [], const loginHitCount = 0;  
  • File Name - UI - jsx/tsx - UserList.jsx, UserAvatar.jsx
  • File Name - Functionality/Action/Reducer/Service - js/ts - UserAction.js, AuthService.js

 

Example of a Demo React Element:

import React from "react";
import ReactDOM from "react-dom";

const title = React.createElement(
  "h1",
  {},
  "Welcome to React Basic to Pro - Day 7"
);

const paragraph = React.createElement(
  "p",
  {},
  "Welcome to React Basic to Pro Description Paragraph"
);

const container = React.createElement("div", {}, [title, paragraph]);

ReactDOM.render(container, document.getElementById("root"));

 

index.js

import React from "react";
import ReactDOM from "react-dom";
import "./index.css";
import reportWebVitals from "./reportWebVitals";
import App2 from "./App2";

ReactDOM.render(<App2 />, document.getElementById("root"));

// If you want to start measuring performance in your app, pass a function
// to log results (for example: reportWebVitals(console.log))
// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
reportWebVitals();

 

Download Source Codehttps://github.com/ManiruzzamanAkash/ReactBasic2Pro/tree/Day7

 

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#4 - let vs const vs var - Clear the ES6 concepts and makes simpler path to learn React