findTheNextPerfectSquare.js

/* 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) {
  // Return the next square if sq is a perfect square, -1 otherwise
  let num = Math.sqrt(sq);

  if (num % 1 !== 0) {
    return -1;
  } else {
    let nextSquare = sq + 1;

    while (Math.sqrt(nextSquare) % 1 !== 0) {
      nextSquare++;
    }

    return nextSquare;
  }
}