time-format.js

function pad(num) {
  return num.toString().padStart(2, "0");
}

function formatTimeDisplay(seconds) {
  const remainingSeconds = seconds % 60;
  const totalMinutes = (seconds - remainingSeconds) / 60;
  const remainingMinutes = totalMinutes % 60;
  const totalHours = (totalMinutes - remainingMinutes) / 60;

  return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
}

// You will need to play computer with this example - use the Python Visualiser https://pythontutor.com/visualize.html#mode=edit
// to help you answer these questions

// Questions

// a) When formatTimeDisplay is called how many times will pad be called?
// My answer: 3 times

// Call formatTimeDisplay with an input of 61, now answer the following:

// b) What is the value assigned to num when pad is called for the first time?
// My answer: 0 (totalHours = 0)

// c) What is the return value of pad is called for the first time?
// My answer: "00"

// d) What is the value assigned to num when pad is called for the last time in this program?  Explain your answer
// My answer: 1 (remainingSeconds = 61 % 60 = 1)

// e) What is the return value assigned to num when pad is called for the last time in this program?  Explain your answer
// My answer: "01" (pad adds a leading zero to make it 2 digits)


// Explanation for input 61:

// totalHours = 0
// remainingMinutes = 1
// remainingSeconds = 1
// pad is called 3 times: pad(0), pad(1), pad(1)
// Returns "00:01:01"