Third Maximum Number

export function thirdMax(nums: number[]): number {
  let first = Number.MIN_SAFE_INTEGER;
  let second = Number.MIN_SAFE_INTEGER;
  let third = Number.MIN_SAFE_INTEGER;
 
  for (const num of nums) {
    if (first === num || second === num || third === num) {
      continue;
    }
    if (first < num) {
      [first, second, third] = [num, first, second];
    } else if (second < num) {
      [second, third] = [num, second];
    } else if (third < num) {
      third = num;
    }
  }
 
  return third === Number.MIN_SAFE_INTEGER ? first : third;
}