map is:exact -package:text -package:charset -package:dense-linear-algebra -package:amazonka-core -package:conduit -package:Cabal-syntax -package:imports -package:base-compat-batteries -package:foldl -package:base-compat -package:containers -package:monoidal-containers package:basement
Map all element a from a block to a new block of b
Map all elements in a list