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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 optimize a JavaScript function that manipulates large datasets in the browser to improve performance?

Asked on Tuesday, Oct 28, 2025

To optimize a JavaScript function that manipulates large datasets in the browser, you can use techniques like debouncing, throttling, or using Web Workers for offloading heavy computations. Here's an …

How do I handle DOM updates in Vanilla JS when using async/await to fetch and display data from an API?

Asked on Monday, Oct 27, 2025

To handle DOM updates in Vanilla JS while using async/await for fetching and displaying data from an API, you can follow this approach: Use async functions to fetch data and then update the DOM elemen…

Why doesn't `addEventListener` work on dynamically added elements, and how can I handle events for them in vanilla JS?

Asked on Sunday, Oct 26, 2025

`addEventListener` does not work on dynamically added elements because the event listeners are bound to existing elements at the time the script runs. To handle events for dynamically added elements, …

Why am I getting "Uncaught SyntaxError: Unexpected token export" when trying to use ES6 modules in my browser?

Asked on Saturday, Oct 25, 2025

The "Uncaught SyntaxError: Unexpected token export" error occurs when you try to use ES6 modules in a browser that does not support them, or when you haven't set up your environment correctly to recog…

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Core Web Performance Q&A