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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 create a custom error class in JavaScript and handle it with try/catch to provide detailed error messages?

    Asked on Wednesday, Dec 24, 2025

    To create a custom error class in JavaScript, extend the built-in Error class. This allows you to throw and catch custom errors with detailed messages. class CustomError extends Error { constructor(me…

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    Why does my IntersectionObserver callback trigger multiple times when scrolling fast?

    Asked on Tuesday, Dec 23, 2025

    The IntersectionObserver callback can trigger multiple times due to rapid changes in the observed element's visibility during fast scrolling. This is expected behavior as the observer reports each int…

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    Why isn't my CSS transition applying when I change the element's style through JavaScript?

    Asked on Monday, Dec 22, 2025

    When CSS transitions don't apply, it is often due to how styles are being updated. Ensure that the transition properties are defined in the CSS and that the style changes trigger the transition. .box …

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    Why does my try-catch block not catch a TypeError when accessing a property on an undefined object in JavaScript?

    Asked on Sunday, Dec 21, 2025

    In JavaScript, a try-catch block is used to handle exceptions, including TypeErrors. If your try-catch block is not catching a TypeError, it might be due to the error occurring outside the block. Ensu…

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