[ryao]

You are correct. I am only highly proficient in a few of them. The others are ones that I have used for varying sized projects for varying reasons, but I only learned the subsets I needed for my purposes. I would say my ability in the others in my main list varies within the low to intermediate range of proficiency.

[johnisgood]

Yeah, same here. This Haskell project is nothing serious, it just prints you the difference in time between two dates. I thought the Haskell implementation would look nice and it did. I initially made it in bash but I realized this is much more complex than what bash can handle. I had to calculate for particular calendars among a lot of other things. I think it works, more or less, however.