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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 merge two arrays of objects based on a common key without duplicates in JavaScript?

Asked on Thursday, Nov 13, 2025

To merge two arrays of objects based on a common key without duplicates, you can use the "reduce" and "map" methods to create a new array that combines both arrays while ensuring unique entries based …

Why does `window` object not exist in Node.js while it does in a browser environment?

Asked on Wednesday, Nov 12, 2025

The "window" object is specific to browser environments as it represents the global context of the web page. In Node.js, the global context is represented by the "global" object instead, as Node.js is…

Why does my try...catch block not catch an error thrown inside an async function using await?

Asked on Tuesday, Nov 11, 2025

When using "try...catch" with "async/await", ensure that the "await" keyword is directly inside the "try" block to catch any errors that the promise might throw. Here's a simple example to illustrate …

How can I handle async data fetching errors in a vanilla JS app to ensure smooth interop with different APIs?

Asked on Monday, Nov 10, 2025

To handle async data fetching errors in a vanilla JS app, you can use the "try...catch" block with "async/await" to manage errors effectively and ensure smooth interop with different APIs. async funct…

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Core Web Performance Q&A