Introduction
You’ve always run for the thrill of it — no schedules, no timers, just the sound of your feet on the pavement.
But now that you’ve joined a competitive running crew, things are getting serious.
Training sessions are timed to the second, and every split second counts.
To keep pace, you’ve picked up the Split-Second Stopwatch — a sleek, high-tech gadget that’s about to become your new best friend.
Instructions
Instructions
Your task is to build a stopwatch to keep precise track of lap times.
The stopwatch uses four commands (start, stop, lap, and reset) to keep track of:
- The current lap’s tracked time
- Previously recorded lap times
What commands can be used depends on which state the stopwatch is in:
- Ready: initial state
- Running: tracking time
- Stopped: not tracking time
| Command | Begin state | End state | Effect |
|---|
| Start | Ready | Running | Start tracking time |
| Start | Stopped | Running | Resume tracking time |
| Stop | Running | Stopped | Stop tracking time |
| Lap | Running | Running | Add current lap to previous laps, then reset current lap |
| Reset | Stopped | Ready | Reset current lap and clear previous laps |
Source: Exercism javascript/split-second-stopwatch