REACT MASTER CLASS /// DATA FLOW /// PROPS /// LIFTING STATE UP /// CONTEXT API /// REACT MASTER CLASS /// DATA FLOW ///

Component Communication

Learn how React passes data across components using Props, Callbacks, and the Context API.

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Tutor:React apps are built with isolated components. But how do they talk to each other? Let's start with the most basic method: Props.


Skill Matrix

UNLOCK NODES BY MASTERING DATA FLOW.

Concept: Props

Props pass data from parent to child. They are immutable from the perspective of the child component.

System Check

Can a Child component modify a prop passed to it by its Parent?

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React Data Flow

Author

Pascual Vila

Frontend Instructor // Code Syllabus

React's architecture forces developers to think about how data moves through an application. Components are like islands; they need bridges to share data.

Parent to Child: Props

The simplest and most common form of communication in React is passing data from a parent component down to a child component using props. Props are read-only to the child.

Child to Parent: Lifting State

Since props only go down, how does a child talk back to the parent? By executing a Callback Function that the parent passed down as a prop. This is known as "Lifting State Up".

Global Data: Context API

When passing props gets tedious (Prop Drilling) because you have to pass them through components that don't even use them, React offers the Context API. It creates a provider that wraps your app, allowing any child component to tap directly into the data stream.

React Comm Glossary

Props

Arguments passed into React components. They flow downwards and are read-only.

snippet.js

Prop Drilling

The process of passing data from one part of the React Component tree to another by going through other parts that do not need the data.

snippet.js

Lifting State Up

Moving state from child components to a common parent so siblings can share data.

snippet.js

Context API

A React feature that lets you share values between components without having to explicitly pass a prop through every level.

snippet.js

Provider

A component provided by Context that allows consuming components to subscribe to context changes.

snippet.js

useContext()

A React Hook that lets you read and subscribe to context from your component.

snippet.js