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React 19

React 19 Fundamentals (From Scratch)

Foundations of React 19: Declarative JSX, props, state immutability, lists & keys, useRef and useEffect lifecycle

5 lessons•~120 min•+150 XP
Topic Progress
0%(0/5)
Remaining to learn: 5

Lessons in Module (5)

5 lessons in order
01

Declarative UI and JSX Mental Model: How JSX Compiles to _jsx

20 min•+30 XP
02

Props, One-Way Data Flow, and Composition via children

25 min•+30 XP
03

Component State (useState), Batching, and the Principle of Immutability

25 min•+30 XP
04

Event Handling, Lists, and the Mechanical Meaning of the key Prop

25 min•+30 XP
05

DOM References (useRef) and Core Synchronization: When useEffect is Essential vs Harmful

25 min•+30 XP
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