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// React useEffect Hook useEffect(() => { const subscription = API.subscribe(userId); return () => subscription.unsubscribe(); }, [userId]);
🤖 AI Explanation: This React hook subscribes to user data when the component mounts or when userId changes. The cleanup function prevents memory leaks by unsubscribing when the component unmounts or userId changes again. Perfect for real-time data subscriptions!

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Supports JavaScript, Python, Java, C++, Go, Rust, and many more programming languages.

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How it works: Simply highlight any code snippet on GitHub, StackOverflow, or any website, and our AI will instantly provide a clear, beginner-friendly explanation.

github.com/microsoft/vscode
function activate(context) { const disposable = vscode.commands.registerCommand('extension.helloWorld', () => { vscode.window.showInformationMessage('Hello World!'); }); context.subscriptions.push(disposable); }
💡 AI Code Explainer
VS Code Extension Setup: This function activates the extension and registers a command called 'helloWorld' that shows a "Hello World!" message. The disposable is added to subscriptions to ensure proper cleanup when the extension deactivates.

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