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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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    How do you handle error responses differently when fetching data from a REST API compared to GraphQL in JavaScript?

    Asked on Monday, Dec 01, 2025

    When handling error responses from REST APIs and GraphQL in JavaScript, the approach differs due to their distinct response structures. REST APIs typically use HTTP status codes, while GraphQL uses a …

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    How can I minimize reflows and repaints when dynamically updating multiple DOM elements with JavaScript?

    Asked on Sunday, Nov 30, 2025

    To minimize reflows and repaints when updating multiple DOM elements, you can use techniques like batching DOM updates, using DocumentFragment, or applying CSS classes for bulk style changes. const fr…

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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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