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

Asked on Oct 02, 2025

Answer

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To merge two arrays without duplicates in JavaScript using ES6 features, you can utilize the Set object and the spread operator.

<!-- BEGIN COPY / PASTE -->
        const array1 = [1, 2, 3];
        const array2 = [3, 4, 5];

        const mergedArray = [...new Set([...array1, ...array2])];

        console.log(mergedArray); // Output: [1, 2, 3, 4, 5]
        <!-- END COPY / PASTE -->

Additional Comment:

The spread operator (...) is used to combine elements from both arrays into a new array.
The Set object automatically removes any duplicate values.
The final result is converted back to an array using the spread operator within an array literal.

✅ Answered with JavaScript best practices.

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