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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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    JavaScript Q&A's are automatically generated daily after 12:00 AM through our proprietary AI-assisted system. Just like humans, AI sometimes revisits similar questions — because new data or insights can lead to different answers. Purchase tags to help expand and support the Q&A Network.

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    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…

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    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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    How does a closure maintain access to variables in its outer scope even after the outer function has returned?

    Asked on Wednesday, Oct 01, 2025

    Closures in JavaScript allow a function to access variables from its outer scope even after the outer function has returned. This is achieved because JavaScript functions form closures around the envi…

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    How can I safely parse a JSON string and handle errors if the format is incorrect?

    Asked on Tuesday, Sep 30, 2025

    To safely parse a JSON string in JavaScript and handle potential errors, you can use a try-catch block around the JSON.parse method. This ensures that if the JSON string is incorrectly formatted, the …

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