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

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useEffect cleanup functions

useEffect cleanup functions

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

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useEffect cleanup functions

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In this session, we'll explore how to prevent memory leaks and unexpected behavior by properly managing side effects within our components. Specifically, we'll focus on using cleanup functions within the UseEffect hook to ensure that actions initiated within a component are correctly terminated when the component unmounts. In strict mode, React mounts, unbounce, and then remounts the component, which can lead to issues if not handled properly. We'll see how this works and how to avoid problems like memory leaks, state updates on unmounted components, and duplicate effects. Let's start with our basic React template. Let's return a simple div saying waiting for 2 seconds dot dot dot. Now I am adding the UseEffect hook from React. This hook allows us to perform side effects in our functional component. This is a crucial step, because we will use it to manage our timer. Okay, let's add an empty UseEffect hook. I've added a UseEffect hook with an empty dependency array. This ensures the…

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