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Introduction to Components

  • This lesson introduces React components and explains how they act as reusable building blocks for creating dynamic user interfaces.

  • Topic Overview

    Components are the building blocks of React applications.
    Every React app is made up of small, reusable components that together form the complete user interface.

    Introduction to Components

    In React, the UI is divided into independent, reusable pieces called components.

    Instead of writing one large file, React encourages breaking the UI into smaller parts.

    Example:

    • Header

    • Footer

    • Sidebar

    • Button

    Each part is a component.

    What is a Component?

    A component is a JavaScript function or class that:

    • Returns JSX

    • Represents a part of the UI

    In simple words:
    A component is a function that returns UI.

    Example:

function Welcome() {
  return <h1>Welcome to React</h1>;
}

  • Why Components Are Important

    Components make applications:

    • Reusable

    • Easy to maintain

    • Easy to understand

    • Scalable

    Without Components:

    • Large files

    • Repeated code

    • Difficult debugging

    With Components:

    • Clean structure

    • Less code

    Better organization
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