Did you use code from an exercise (to solve a problem) in your life?

I just completed the “Freelancer Rates” exercise today, and my partner had me calculate how many days she can afford her employee at their salary.
Not going to go into detail about her business …I just liked how the #days_in_budget() code was suddenly applied in a live use case.

I know a lot of people here will be finding ways to help themselves with a little code and a quick script, but may be there are some interesting stories of how an Exercism exercise helped you solve a problem in your life?