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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 handle a 404 error gracefully when using fetch to call an API and parse JSON in JavaScript?

Asked on Wednesday, Nov 05, 2025

To handle a 404 error gracefully when using "fetch" to call an API and parse JSON, you can check the response status and handle errors accordingly. fetch('https://api.example.com/data') .then(response…

How can I reduce the execution time of large DOM updates in JavaScript for better performance?

Asked on Tuesday, Nov 04, 2025

To reduce the execution time of large DOM updates in JavaScript, you can use techniques like batching updates, using Document Fragments, or leveraging requestAnimationFrame for smoother updates. const…

Why does `addEventListener` not trigger on dynamically added DOM elements, and how can I fix this?

Asked on Monday, Nov 03, 2025

When you add event listeners using "addEventListener" on elements that are dynamically added to the DOM, the listeners won't automatically apply to those new elements. This is because the event listen…

Why does my try-catch block not catch errors from an async function call?

Asked on Sunday, Nov 02, 2025

A try-catch block does not catch errors from an async function call because the async function returns a Promise. To handle errors from async functions, you should use the "catch" method on the Promis…

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Core Web Performance Q&A