const arr = [1, 5, 2, 1, 6, 2, 2, 9]; const countPairs = (arr = []) => { const { length } = arr; let count = 0; // making a shallow copy so that the original array remains unaltered const copy = arr.slice(); copy.sort((a, b) => a - b); for(let i = 0; i < length; i++){ if(copy[i] === copy[i + 1]){ i++; count++; }; }; return count; }; console.log(countPairs(arr));
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