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How can I merge two arrays without duplicates in JavaScript?

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How can I merge two arrays without duplicates in JavaScript?

Asked on Oct 16, 2025

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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.

<!-- 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 Set object automatically removes duplicate values.
The spread operator "..." is used to merge "array1" and "array2" into a new array.
The final result is stored in "mergedArray", which contains only unique values from both arrays.

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How can I merge two arrays without duplicates in JavaScript?

Asked on Oct 16, 2025

Answer

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