An application that calculates the total "active" distance and pace for a running activity with multiple split laps of effort and recovery.
I undertook the task of learning to build a fully functioning web application to address a few points:
Having learned to code by writing tests and having been in the position in the past of making the mistake of maintaining a test suite that tests the bulk of the acceptance criteria through the UI, I knew that learning to build an application of this sort would help me avoid this mistake again.
...and I will get back to you.