This isn’t super constructive criticism or anything but seeing that plaid made me LOL. I’m not sure if that is in line with all the latest design trends or whatever, but I sure enjoyed it. The options to customize the appearance is nice, too. It’s cool that you’re adding features that aren’t specifically requested by the challenge. (Unless they are and I didn’t notice…)
Otherwise, one thing I would like to see is a running tally of what buttons I have pushed prior to “=” Something like [ 2 x 4 +5 …] etc. like on the windows calculator. I’m not quite there yet in the curriculum myself, so I can’t give any guidance on how to make that happen.
Definitely good work, though. Keep it up!
Try to add 0.2 to 0.4.
Large numbers are calculated but extend past the text window.
Sequence 6, -, x, 3 = NaN