Web Reference: Jul 23, 2025 · This is the most common approach for counting frequency in an array. Each array element becomes a key in the object, and its value is incremented as the element appears. In Javascript, I'm trying to take an initial array of number values and count the elements inside it. Ideally, the result would be two new arrays, the first specifying each unique element, and the second containing the number of times each element occurs. Counting frequencies of array elements means we have to count the number of times an element from the array appears in the given array. We will be discussing five different approaches to achieve this. We can use some inbuilt data structures or external libraries for easy implementation.
YouTube Excerpt: This questions has many solutions but this one is the most efficient as the time complexity is O(n)
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Last Updated: April 8, 2026
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