Web Reference: Jul 23, 2025 · The JavaScript Set () method creates an object containing only unique values. To remove the duplicate elements we can use the set and then convert the object back to array to get the only unique values. Loop through, remove duplicates, and create a clone array place holder, because the array index will not be updated. Loop backward for better performance (your loop won’t need to keep checking the length of your array). In this tutorial, you will learn some techniques to to remove duplicates from an array in JavaScript.
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