countOccurrences javascript Code Snippet in 2024
arrayintermediate
Last Updated: 9 October 2024
Counts the occurrences of a value in an array.
- Use
Array.prototype.reduce()to increment a counter each time the specific value is encountered inside the array.
const countOccurrences = (arr, val) =>
arr.reduce((a, v) => (v === val ? a + 1 : a), 0);countOccurrences([1, 1, 2, 1, 2, 3], 1); // 3
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