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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 can I debug an "Uncaught TypeError" when using async/await with fetch in JavaScript?

Asked on Sunday, Nov 09, 2025

An "Uncaught TypeError" in JavaScript often occurs when a variable or object is not of the expected type. When using async/await with fetch, this error might arise if the response is not handled corre…

Why does `fetch()` return a promise, and how can I handle JSON data received from an API response?

Asked on Saturday, Nov 08, 2025

The `fetch()` function returns a promise because it performs an asynchronous operation to request resources over the network. To handle JSON data from an API response, you can chain `.then()` methods …

How can I handle errors gracefully with fetch when the API returns a non-JSON response?

Asked on Friday, Nov 07, 2025

When using the Fetch API, you can handle errors gracefully by checking the response status and content type before attempting to parse the response as JSON. This ensures that you handle non-JSON respo…

How can I minimize reflows and repaints when updating multiple DOM elements in a loop?

Asked on Thursday, Nov 06, 2025

To minimize reflows and repaints when updating multiple DOM elements, you can use a Document Fragment or batch DOM updates outside the loop. This reduces the number of times the browser has to re-rend…

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Core Web Performance Q&A