Check for Perfect Square Without Using Math Libraries in JavaScript

We are required to write a JavaScript function that takes in a number and returns a boolean based on the fact whether or not the number is a perfect square.

Examples of perfect square numbers −

4, 16, 81, 441, 256, 729, 9801

Let’s write the code for this function −

const num = 81;
const isPerfectSquare = num => {
   let ind = 1;
      while(ind * ind <= num){
         if(ind * ind !== num){
            ind++;
            continue;
         };
      return true;
   };
   return false;
};
console.log(isPerfectSquare(81));
console.log(isPerfectSquare(9801));
console.log(isPerfectSquare(99));
console.log(isPerfectSquare(441));
console.log(isPerfectSquare(7648));

Output

Following is the output in the console −

true
true
false
true
false