23 - Dash Insert.js

// Step By Step
function DashInsert (num) {
    // First, we convert the input number into a string
    // This allows us to add the character to our answer rather than summing the two.
    num = num.toString();
    // Next, we declare and initialize a variable to hold our answer string.
    var answer = '';
  
    // After that, we loop through each character in our input number...
    for (var i = 0; i < num.length; i++) {
      // ...and for every character after the first, we check if the current and previous character are odd.
      if ((i > 0) && (num[i] % 2 === 1) && (num[i - 1] % 2 === 1)) {
        // If both are, we add a dash to our answer.
        answer += '-';
      }
      // No matter whether or not we add a dash, we add the current number to our answer string.
      answer += num[i];
    }
  
    // Finally, we return our answer.
    return answer;
  }
  
  // No Comments
  function DashInsert (num) {
    num = num.toString();
    var answer = '';
  
    for (var i = 0, x = num.length; i < x; i++) {
      if ((i > 0) && (num[i] % 2 === 1) && (num[i - 1] % 2 === 1)) {
        answer += '-';
      }
  
      answer += num[i];
    }
  
    return answer;
  }