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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 might `catch` not trigger when a promise fails, and how can I ensure proper error handling in async functions?

Asked on Friday, Oct 24, 2025

When using promises in JavaScript, the `catch` block might not trigger if the promise is not properly rejected or if errors are not propagated correctly. To ensure proper error handling in async funct…

How can I use destructuring to swap values of two variables in JavaScript?

Asked on Thursday, Oct 23, 2025

Destructuring in JavaScript provides a concise way to swap the values of two variables without needing a temporary variable. Here's how you can do it: let a = 1; let b = 2; [a, b] = [b, a]; console.lo…

How can I merge two arrays of objects by a unique key in JavaScript while preserving all properties?

Asked on Wednesday, Oct 22, 2025

To merge two arrays of objects by a unique key in JavaScript while preserving all properties, you can use the "map" and "reduce" methods. This approach ensures that objects with the same key are combi…

Why is my fetch request returning a promise instead of JSON, and how can I handle the response data properly?

Asked on Tuesday, Oct 21, 2025

When you make a fetch request in JavaScript, it returns a Promise that resolves to the Response object. To extract JSON data from the response, you need to call the `.json()` method on the Response ob…

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Core Web Performance Q&A