20 - Division Stringified.js

// Step By Step

function DivisionStringified (num1, num2) {
    // First, we use the Math.round method to calculate our product...
    // ...and then use the .toString method to convert the reusltant number into a string.
    var result = Math.round(num1 / num2).toString();
  
    // Next, we use the .split method to convert our result variable into an array so it can be further manipulated.
    // Note that we pass in an empty string ("") into the .split method to split the result variable at every character.
    var resultArr = result.split('');
  
    // Next, we check if our result is greater than 1000.
    if (result >= 1000) {
      // If it is, we loop through each item in our result array...
      // ...starting at the third character from the end (i = result.length - 3)...
      // ...moving back three charactres each time (i -= 3)...
      // ...and stopping when we get to the start of the string (i > 0)
      for (var i = result.length - 3; i > 0; i -= 3) {
        // At every third character we use the .splice method to insert a comma.
        // Note that the first arguement of the .splice is where the method inserts things into the array (i),
        // ...the second controls how many array items are removed (0),
        // ...and the third controls what is inserted (",").
        resultArr.splice(i, 0, ',');
      }
    }
  
    // Finally, we return our result array with the .join method to covert it into a string.
    return resultArr.join('');
  }
  
  // No Comments
  function DivisionStringified (num1, num2) {
    var result = Math.round(num1 / num2).toString();
    var resultArr = result.split('');
  
    if (result >= 1000) {
      for (var i = result.length - 3; i > 0; i -= 3) {
        resultArr.splice(i, 0, ',');
      }
    }
  
    return resultArr.join('');
  }