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

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Introduction to useEffect

Introduction to useEffect

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

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Introduction to useEffect

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Welcome to this session on Use Effect in React. Our goal today is to understand why we need React Use Effect and how to use it. We'll achieve this by fetching weather data, first with a button click, then automatically on page load. I'll guide you through each step of the process. Let's start with our basic React template. Now I'm adding a heading to display the weather information. You'll see a friendly heading welcoming you to our weather app, setting the stage for the exciting updates that follow. Now it is time to introduce state management. I've imported useState from React and initialized a state variable called weather which will hold our fetched weather data. It's currently set to null, indicating no data yet. SetWeather is the function that you will use to update this state. To display the weather data, I'm using a conditional rendering. The weather data is only rendered if the weather state is not null. This prevents errors when the app initially loads, before the data is…

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