Web Reference: Jul 22, 2025 · The main idea is to first sort the array so that duplicate elements appear next to each other. Then, a single pass is made to compare each element with its previous one. Jul 9, 2016 · Use a simple for loop instead of forEach if you don't want this to break in older browsers. @web_dev he creates an associative array object called count that will have a key value pair for each unique element in the array, where the key is the unique element value and the value is the count. Jan 16, 2026 · In this blog, we’ll explore **5 practical methods** to count duplicate values in a JavaScript array, complete with code examples, explanations, and edge cases. By the end, you’ll have a clear understanding of which method to use for different scenarios.
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