Learn everything about React state and props, including useState hook, functional & class components, props vs state, and effective state management in React.
Introduction to State and Props in React
React has become one of the most popular JavaScript libraries for building modern web applications. At the heart of React’s component-driven architecture lie state and props. They enable dynamic data handling, seamless React component communication, and a structured React one-way data flow that makes applications scalable and maintainable.
In this comprehensive guide, we will dive deep into React state, React props, functional components React, class components React, useState hook, React setState, props immutability React, and advanced concepts like lifting state up, parent to child communication React, React state updates, props read-only React, state management in React, React data flow, and much more. Whether you’re a beginner or looking to refine your skills, this 4000-word guide will help you master state vs props and create production-ready applications.
What Are Props in React?
Props (short for properties) are read-only attributes used to pass data from a parent component to a child component. They are an essential part of React one-way data flow, ensuring that components remain reusable and maintainable.
Key Features of Props:
Immutable: Props cannot be modified by the receiving component (props immutability React).
Read-Only: They maintain props read-only React nature, ensuring data integrity.
Flexible: Props allow parent to child communication React, enabling dynamic UI updates.
Example:
function Welcome(props) {
return <h1>Hello, {props.name}!</h1>;
}
<Welcome name=”John” />
Here, name is passed as a prop to the Welcome component.
What Is State in React?
State represents data that can change over time within a component. Unlike props, which are passed from a parent, React component state is managed internally by the component itself.
Key Features of State:
Mutable: You can update state values dynamically.
Triggers Re-render: React state updates re-render components to reflect new data.
Local to Component: State is specific to the component but can be shared using lifting state up.
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