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

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Adding interactivity: Review

Adding interactivity: Review

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

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Adding interactivity: Review

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Welcome back! In this session, we're going to review everything we learned in the Adding Interactivity chapter. This is where React really starts to feel alive, because we go beyond static components and make our apps respond to user input. We'll walk through each key idea step by step, reviewing the code and pointing out the rules you need to follow. Let's get started! Let's start with the most basic way to make your React app interactive – responding to events. Here, we attach a click handler directly to a button. Notice how we define the handleClick function inside the component and pass it to onClick. This is the foundation of interactivity in React. Next, we'll see why simply updating local variables won't trigger UI updates. Here we try updating a local variable count when the button is clicked. The console logs the incremented value, but the UI doesn't update. This demonstrates a key rule in React – only state changes trigger a re-render. Now we create a reusable button…

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