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1function twoSum(nums, target) {
2  const map = new Map();
3  for (let i = 0; i < nums.length; i++) {
4    const complement = target - nums[i];
5    if (map.has(complement)) {
6      return [map.get(complement), i];
7    }
8    map.set(nums[i], i);
9  }
10  return [];
11}