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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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Why am I getting a `SyntaxError: Unexpected token` when parsing JSON from a fetch response?

Asked on Thursday, Nov 20, 2025

This error typically occurs when the response from a fetch request is not valid JSON. This can happen if the response is empty, malformed, or if you try to parse it before ensuring it's in the correct…

How can I override a method in a prototype chain without affecting other instances in JavaScript?

Asked on Wednesday, Nov 19, 2025

To override a method in a prototype chain without affecting other instances, you can define the method directly on the instance itself. This ensures that only the specific instance has the overridden …

How can I prevent event bubbling while still using event delegation in my JavaScript application?

Asked on Tuesday, Nov 18, 2025

Event bubbling can be prevented by using the "stopPropagation" method on the event object. This allows you to use event delegation while stopping the event from bubbling up to parent elements. documen…

Why isn't tree shaking removing unused code from my ES6 module bundle in Webpack?

Asked on Monday, Nov 17, 2025

Tree shaking is a technique used to eliminate dead code in JavaScript modules. If it's not working in your Webpack setup, it might be due to improper configuration or usage of non-ES6 module syntax. H…

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Core Web Performance Q&A