Square Every Digit

Instructions:

Welcome. In this kata, you are asked to square every digit of a number and concatenate them.

For example, if we run 9119 through the function, 811181 will come out, because 92 is 81 and 12 is 1. (81-1-1-81)

Example #2: An input of 765 will/should return 493625 because 72 is 49, 62 is 36, and 52 is 25. (49-36-25)

Note: The function accepts an integer and returns an integer.

Thoughts:

1. I change the number into an array by changing first into a string and split the string.


2. I transform array by using map() function to raise each element of the array to the power of 2 and at the end join them all together.


3. Since i have to return a number at the end I transform the sqDigits from string into number.

Solution:

function squareDigits(num) {

const arr = num.toString().split("");

const sqDigits = arr.map((el) => Math.pow(Number(el), 2)).join("");

return Number(sqDigits);

}

This is a CodeWars Challenge of 7kyu Rank (https://www.codewars.com/kata/546e2562b03326a88e000020/train/javascript)