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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 without duplicates in JavaScript?

Asked on Thursday, Oct 16, 2025

To merge two arrays without duplicates in JavaScript, you can use the Set object to automatically handle duplicate values, combined with the spread operator to merge the arrays. const array1 = [1, 2, …

How can I chain multiple promises to execute sequentially in JavaScript?

Asked on Wednesday, Oct 15, 2025

To chain multiple promises in JavaScript and execute them sequentially, you can use the "then" method. Each "then" returns a new promise, allowing you to chain further operations. function firstTask()…

How can I securely store and retrieve user preferences using the Web Storage API in JavaScript?

Asked on Tuesday, Oct 14, 2025

To securely store and retrieve user preferences using the Web Storage API, you can use the "localStorage" or "sessionStorage" objects. Here's a simple example of how to do this: // Storing user prefer…

How can I securely store and access user preferences in the browser using localStorage or sessionStorage?

Asked on Monday, Oct 13, 2025

To securely store and access user preferences in the browser, you can use the Web Storage API, which includes "localStorage" and "sessionStorage". Here's a basic example of how to store and retrieve d…

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Core Web Performance Q&A