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Discover clear, example-based answers to real JavaScript challenges. From functions, arrays, and DOM manipulation to ES6+ syntax and async programming, every response is written to help you understand how and why things work. Whether you’re building interactive sites or learning core logic, these Q&As make JavaScript easier and more powerful.

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    JavaScript Q&A's are automatically generated daily after 12:00 AM through our proprietary AI-assisted system. Just like humans, AI sometimes revisits similar questions — because new data or insights can lead to different answers. Purchase tags to help expand and support the Q&A Network.

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    How can I reduce reflows and repaints when dynamically updating a large list in the DOM?

    Asked on Saturday, Nov 29, 2025

    To reduce reflows and repaints when dynamically updating a large list in the DOM, you can use a technique called "document fragment" to batch DOM updates and minimize performance costs. const list = d…

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    Can I use the spread operator to merge two objects while excluding certain properties from one of them?

    Asked on Friday, Nov 28, 2025

    Yes, you can use the spread operator to merge two objects and exclude certain properties by using destructuring assignment. Here's how you can do it: const obj1 = { a: 1, b: 2, c: 3 }; const obj2 = { …

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    How can I create a custom error type to handle specific network failures in a try/catch block in JavaScript?

    Asked on Thursday, Nov 27, 2025

    To create a custom error type in JavaScript for handling specific network failures, you can extend the built-in Error class. This allows you to throw and catch instances of your custom error type in a…

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    How can I create and throw a custom error in JavaScript within a try/catch block for better error handling?

    Asked on Wednesday, Nov 26, 2025

    To create and throw a custom error in JavaScript, you can define a new error class that extends the built-in Error class. This allows you to provide a custom message and additional properties if neede…

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