React core concepts: Components, DOM, useState and useEffect

In this 38-minute deep dive, we'll cover the core concepts of React that every developer needs to understand in order to build scalable, efficient applications. This session will explain fundamental topics like:

What is React?
The DOM vs Virtual DOM: How React uses the Virtual DOM to boost performance.
Why is React so fast? Understanding React’s efficiency under the hood.
Component-Based Thinking: How to break down your UI into reusable, manageable components.
useState: How React manages component state and why it's different from regular variables.
useEffect: Handling side effects and asynchronous operations in React.

With plenty of code examples and clear explanations, this video provides a strong foundation for working with React in real-world applications. By the end, you'll have a good understanding of how React works, why it's so popular, and how to think in terms of components to structure your applications effectively.

This is essential knowledge for anyone looking to level up their React skills and start building professional-grade applications.

0:00 Welcome to Day 2
0:17 Content Index
0:49 What is React?
1:54 Why should I use React?
2:56 What is DOM and Virtual DOM?
3:23 DOM Concept Example
4:09 Understanding Virtual DOM as an extension of DOM
5:01 Why is React Fast? - Component Driven Example
7:28 What are Components?
8:26 Understand Component Breakdown and Render Tree
8:52 Component Composition
11:13 What is JSX?
11:40 Important Callouts - JSX
13:57 Understanding useState
14:19 What is Component State?
15:20 What is useState?
16:00 useState - Code Example
18:08 useState - vs regular const variables
18:47 useState - Code Example with normal JS Variables
20:36 useState - implementation 2
22:20 Understanding the React state updates
23:23 useState - Callback implementation
25:48 Understanding useEffect
26:00 useEffect - What are Side Effects?
27:21 useEffect - Handle Side Effects predictably
27:51 useEffect - structure
28:55 useEffect - without dependency array
29:42 useEffect - with empty dependency array
30:40 useEffect - double logs - React Strict Mode
31:45 useEffect - with prop in dependency array - fetch data
35:24 useEffect - with cleanup function
38:19 Wrap-up - Thank you

Тэги:

#useState #useEffect #diffing #virtual_DOM #DOM #reconciliation #callback_implementation

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