如何计算数组中重复值并存储在数组中

function findDuplicates(nums) {
  const hashTable = {};
  const result = [];

  for (let i = 0; i < nums.length; i++) {
    const num = nums[i];
    if (hashTable[num]) {
      hashTable[num]++;
    } else {
      hashTable[num] = 1;
    }
  }

  for (const num in hashTable) {
    if (hashTable[num] > 1) {
      result.push(parseInt(num));
    }
  }

  return result;
}

// 示例用法
const nums = [1, 2, 2, 3, 4, 4, 5];
const duplicates = findDuplicates(nums);
console.log(duplicates);  // [2, 4]