Welcome to the JavaScript Q&A Network

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 do you use destructuring to swap two variables in JavaScript?

Asked on Sunday, Oct 05, 2025

Destructuring in JavaScript allows you to easily swap two variables without using a temporary variable. Here's how you can do it: let a = 1; let b = 2; [a, b] = [b, a]; console.log(a); // 2 console.lo…

How can I use destructuring to swap two variables in ES6?

Asked on Saturday, Oct 04, 2025

Destructuring in ES6 allows you to swap two variables easily without needing a temporary variable. Here's how you can do it: let a = 1; let b = 2; [a, b] = [b, a]; console.log(a); // 2 console.log(b);…

How can I use localStorage to persist user settings across browser sessions?

Asked on Friday, Oct 03, 2025

LocalStorage allows you to store data in the browser that persists even after the browser is closed. Here's how you can use it to save and retrieve user settings. // Save user settings to localStorage…

How can I merge two arrays without duplicates using ES6 features?

Asked on Thursday, Oct 02, 2025

To merge two arrays without duplicates in JavaScript using ES6 features, you can utilize the Set object and the spread operator. const array1 = [1, 2, 3]; const array2 = [3, 4, 5]; const mergedArray =…

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Core Web Performance Q&A