answers all questions about pad and formatTimeDisplay

Author: remimarcelle

Sprint-2/4-mandatory-interpret/time-format.js

@@ -15,24 +15,52 @@ function formatTimeDisplay(seconds) {
   return `${pad(totalHours)}:${pad(remainingMinutes)}:${pad(remainingSeconds)}`;
 }
 
+console.log(formatTimeDisplay(61)); // Should print "00:01:01"
+
 // 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?
 // =============> write your answer here
+// The pad function is called 3 times within formatTimeDisplay: once
+// for totalHours, once for remainingMinutes, and once for 
+// remainingSeconds. Therefore, pad will be called 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?
 // =============> write your answer here
+// 0 (totalHours) is assigned to num because 61 seconds is less than 
+// 3600 seconds (1 hour), so totalHours is calculated as 0.
 
 // c) What is the return value of pad is called for the first time?
 // =============> write your answer here
+// "00" is the return value of pad because num is 0 because totalHours
+// is 0, and the while loop in pad will add a "0" to the left of 
+// numString until its length is at least 2. Since numString starts as
+// "0", it will become "00" after one iteration of the loop, and then it
+// will be returned as the final result of the first call to pad. Also,
+// "0".length is 1, which is less than 2, so the loop will execute once,
+// prepends "0" and makes "00". Now "00".length is 2, which is not less
+// than 2, so the loop will stop and "00" will be returned.
 
 // d) What is the value assigned to num when pad is called for the last time in this program?  Explain your answer
 // =============> write your answer here
+// For seconds = 61,  the last call to pad is for remainingSeconds.
+// AS calculated in (b), remainingSeconds is 1. So the value assigned
+// to num when pad is called for the last time is 1. This is because
+// remainingSeconds is calculated as seconds % 60, which gives the
+// remainder of 61 divided by 60, resulting in 1. Therefore, num is
+// assigned the value of 1 during the last call to pad in this program.
+
 
 // e) What is the return value of pad when it is called for the last time in this program?  Explain your answer
 // =============> write your answer here
+// As calculated in (d), num is 1. The pad function converst num to
+// a string ("1") and then checks its length. Since the length is 1,
+// it prepends "0" to make it to "01". So, the return value of pad
+// when called for the last time is "01". This is because the while loop
+// in pad will execute once.