formatting questions on the forum

// Implement the following functions. Write at least 2
// assertions for each one (the assertions are how you
// will test your code)
//*********************************************************

function lastLetterSort(stringArray) {
  function byLastLetter(a, b) {
    //TODO: implement me. sort the strings in alphabetical
    // order using their last letter
  }
  stringArray.sort(byLastLetter);
}

function sumArray(numberArray) {
  var sum = 0;
  // TODO: implement me using forEach
  return sum;
}

function sumSort(arrayOfArrays) {
  arrayOfArrays.sort(function(item) {
    // TODO: implement me using sumArray
    //  order the arrays based on the sum of the numbers
    //  inside each array
  });
}