What is a higher-order component?

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React handles events using a synthetic event system, which is a cross-browser wrapper around the native browser events. This system ensures that events behave consistently across different browsers and improves performance by using event delegation.

A higher-order component (HOC) in React is a function that takes a component as an argument and returns a new component with enhanced or additional behavior. HOCs are a pattern used to reuse component logic, without modifying the original component directly.

Syntax Example:

jsx

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function withExtraInfo(WrappedComponent) {

  return function EnhancedComponent(props) {

    return <WrappedComponent {...props} extraInfo="Some info" />;

  };

}

Key Concepts:

HOCs don’t modify the original component. Instead, they wrap it with a container component.

They are pure functions — they don't mutate input but return new components.

Common use cases include:

Code reuse and logic abstraction

Conditional rendering

Access control

Injecting props or state management logic

Real-World Example:

Suppose you have multiple components that need user authentication logic. Instead of repeating the logic, you could use a HOC like withAuthProtection(MyComponent) to wrap those components and apply the same behavior.

Important Notes:

HOCs do not work with functional components' hooks directly; you manage logic through props.

They follow a similar idea to higher-order functions in JavaScript.

In short, a HOC is a powerful design pattern in React to compose behavior across components efficiently.

Read More

How does React handle events?

What is the purpose of components in React JS?

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