Calculator App using Test Driven Development

What are you most proud of, and what would you do differently next time?

Using TDD made it much simpler for me to create the features that I needed in the calculator while remaining confident that I had no introduced any additional bugs or reversions.

What challenges did you encounter, and how did you overcome them?

Since there is no native "slider" element, I found a group of styles that would recreate the look and feel of a slider with a "range" input field. I chose to keep those styles separated from the rest of the styling, to keep the slider modular.

What specific areas of your project would you like help with?

I had the greatest difficulty in reliably formatting the calculator's results to a specific number of digits without introducing other bugs. Any pointers would be appreciated.