Squared concatenation of a Number in JavaScript

We are required to write a JavaScript function that takes in a number and returns a new number in which all the digits of the original number are squared and concatenated.

For example: If the number is −

99

Then the output should be −

8181

because 9^2 is 81 and 1^2 is 1.

Therefore, let’s write the code for this function −

Example

The code for this will be −

const num = 9119;
const squared = num => {
   const numStr = String(num);
   let res = '';
   for(let i = 0; i < numStr.length; i++){
      const square = Math.pow(+numStr[i], 2);
      res += square;
   };
   return res;
};
console.log(squared(num));

Output

The output in the console will be −

811181