From the course: Master React 19 and Next.js 16 with Hands-On Projects and Real-World Applications

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Controlled props pattern

Controlled props pattern

From the course: Master React 19 and Next.js 16 with Hands-On Projects and Real-World Applications

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Controlled props pattern

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This session will guide you through implementing the Controlled Props pattern in React. This pattern allows you to manage a component's state either internally, within the component itself, uncontrolled, or externally by a parent component, controlled. By the end of this session, you'll understand how to build flexible and reusable components that can adapt to different state management needs. Let's start with a simple React app. Let's create a Components folder inside src and add Rating.jsx, a reusable component for displaying and selecting ratings. Moving to Rating.jsx, let's declare a functional component called Rating using an arrow function. If value is provided, this makes the component controlled. Parent manages the state. I will explain this in detail later. If no default value is passed, it defaults to 0. This is for uncontrolled mode. The default number of stars is 5. OnChange is a callback function fired when the rating changes, e.g. user clicks a star. Let's add the…

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