React Composition Explained — Component Composition Patterns

In this tutorial, you will learn about React Composition Explained. We cover key concepts, practical examples, and best practices to help you master this topic.

React composition is the practice of combining small, focused components to build complex UIs, using props, children, and component patterns instead of inheritance.

What You'll Learn

• What composition means in React
• How to use the children prop for composition
• How to create specialized components
• How container components work
• How to avoid prop drilling with composition

Why It Matters

Composition is React's alternative to inheritance. It creates flexible, reusable components that can be combined in ways the original developer did not anticipate.

function Dialog({ open, onClose, children }) {
  if (!open) return null;
  return (
    <div className="overlay">
      <div className="dialog">
        <button className="close-btn" onClick={onClose}>X</button>
        {children}
      </div>
    </div>
  );
}

function ConfirmDialog({ title, message, onConfirm, onCancel, open }) {
  return (
    <Dialog open={open} onClose={onCancel}>
      <h2>{title}</h2>
      <p>{message}</p>
      <div className="actions">
        <button onClick={onConfirm}>Confirm</button>
        <button onClick={onCancel}>Cancel</button>
      </div>
    </Dialog>
  );
}

Expected output: A reusable Dialog component composed with ConfirmDialog providing specific content through children.