findSumOfDigits()

Step 1: Understand the Problem

Firstly, we need to understand what is required. The function 'find-sum-of-digits' means we need a function that can take a number as input and returns the sum of its digits. For example, if we input the number 123, the function should return 6 (which is the total of 1, 2, and 3).

function findSumOfDigits(number) {
  // TODO: Implement solution
}

Step 2: Convert to String

The next step is converting the given number into a string. It is easier to access individual digits of a number when it is in a string format.

function findSumOfDigits(number) {
  let stringNumber = number.toString();
}

Step 3: Split the String

After converting to a string, the number is split into individual digits. The split method divides a string into an ordered list of substrings and returns it as an array.

function findSumOfDigits(number) {
  let stringNumber = number.toString();
  let digits = stringNumber.split('');
}

Step 4: Sum the Digits

Now we need to iterate over the array, convert each digit back to a number, and then add all the numbers together.

function findSumOfDigits(number) {
  let stringNumber = number.toString();
  let digits = stringNumber.split('');
  let sum = 0;
  for(let i=0; i<digits.length; i++){
    sum += parseInt(digits[i], 10);
  }
}

Step 5: Return the Sum

Finally, we make sure that our function returns the sum of the digits.

function findSumOfDigits(number) {
  let stringNumber = number.toString();
  let digits = stringNumber.split('');
  let sum = 0;
  for(let i=0; i<digits.length; i++){
    sum += parseInt(digits[i], 10);
  }
  return sum;
}

So that's it! We have created a function that takes the number as an input and returns the sum of its digits. This function can be helpful in many different coding scenarios where you need to do operations on individual digits of a number.