findNextSquare.js

function findNextSquare(sq) {
  // Optimal solution
  // return Math.sqrt(sq)%1? -1 : Math.pow(Math.sqrt(sq)+1,2);
  // Return the next square if sq if a perfect square, -1 otherwise
  var curVal = Math.sqrt(sq) + 1
  var nextSq = Math.sqrt(sq) + 1
  nextSq *= nextSq
  
  //console.log(sq)
  //console.log(currentNumber)
  //console.log(nextSq * nextSq)
  
  if (nextSq == Math.floor(curVal*curVal))
    //console.log(nextSq * nextSq)
     return nextSq
  else
    return -1;
    //console.log(-1)
}