17.Find the next perfect square!

Description:

You might know some pretty large perfect squares. But what about the NEXT one?

Complete the findNextSquare method that finds the next integral perfect square after the one passed as a parameter. Recall that an integral perfect square is an integer n such that sqrt(n) is also an integer.

If the parameter is itself not a perfect square then -1 should be returned. You may assume the parameter is non-negative.

Examples:(Input --> Output)

121 --> 144
625 --> 676
114 --> -1 since 114 is not a perfect square

 

 

function findNextSquare(sq) {
  const num = Math.sqrt(sq);
  
  if (Number.isInteger(num) === false) {
    return -1;
  } 
  
  return Math.pow(num+1, 2);
}

 

먼저 , Math.sqrt() 을 사용해서 주어진 숫자의 제곱근을 반환했다. 

그다음에 정수가 아닌 숫자들은 -1을 리턴해줬다. 

그리고 정수인 숫자들은 제곱근에 1을 더하고 제곱해주는것(Math.pow(num+1, 2))을 리턴했다.