Audio Files

To do this one, we need to create three numbers:

• Hour
• Minute
• Second

We also need to make sure each number is exactly two digits - e.g. 30 or 03. That way, we always get the 00:00:00 format, which will allow us to sort by duration.

So first, we need to get those counts. We won’t worry about the digit counts just yet.

• Hours - There are 3,600 seconds in an hour (60 minutes x 60 seconds). So we divide the second count by 3600.
  • We can’t have a remainder, so we’ll take the floor() value which will just give us the last whole hour.
• Minutes - There are two ways to do this:
  • Take the original second count and subtract (hours * 3600). Then take that number, divide it by 60, and store the floor() again.
  • The faster way to do it, which is essentially the same, is to get the remainder: seconds % 3600 - from there, we can divide the result by 60 and get the floor()
• Seconds - Here we can first get the minute-level remainder by doing seconds % 3600, then we can get that number’s remainder by adding % 60. This will get us the remaining seconds after we’ve accounted for hours and minutes.

Next, we need to account for any hour/minute/second counts that are between 0-9. For these, we need to prepend a 0 – otherwise we’d get stuff like 01:9:34. This should read 01:09:34 instead.

So after creating our number variables, we’ll create an array. Each will conditionally prepend a zero if the variable is <= 9.

Finally, we’ll call join(":") on the returned array.