Yeah, being a math person I jumped on the pure FP bandwagon full time for four years. But my experience has been that in anything but pet projects, it gets to t

Yeah, being a math person I jumped on the pure FP bandwagon full time for four years. But my experience has been that in anything but pet projects, it gets to the point of replacing impurity with incompatible layers of abstractions to create the illusion of some minimal level of allowed impurity and awkward buggy glue code in hopes to hold everything together. Working with an illusion of impurity on top of purity isn't any better than working with impurity directly. Or in Greenspun's Tenth Rule Of Programming terms: Any sufficiently complicated Haskell/PureScript program contains an ad-hoc, informally-specified, bug-ridden, slow implementation of half of a Python VM trying to share state with an ad-hoc, informally-specified, bug-ridden, slow implementation of half of a JS VM trying to communicate with an ad-hoc, informally-specified, bug-ridden, slow implementation of half of a .Net VM. Anyway I like typescript now too.