I was at OPLSS[0] in 2018 and Enzo Alda gave a talk/demo on ZenSheets, his in-progress reactive spreadsheet thing where you could write lambdas in the cells, call them in formulas from other cells, etc. That talk wasn't recorded, but a similar demo can be found here.[1]
[0]: https://www.cs.uoregon.edu/research/summerschool/summer18