two-sum

var twoSum = function (nums, target) {
  const newmap = new Map();
  for (let i = 0; i < nums.length; i++) {
    const number = target - nums[i];
    if (newmap.has(number)) {
      return [newmap.get(number), i];
    } else {
      newmap.set(nums[i], i);
    }
  }
};