javascript functional-programming composition algebraic-data-types recursion monad transducers polymorphism monad-transformers purity pure-function sum-types folding function-composition point-free tagged-unions catamorphism anamorphism corecursion lazyness

task functional browser functional-programming fold io-monad algebraic-data-types functor category-theory monoid maybe either either-monad task-monad maybe-monad catamorphism deno denoland

typescript validation pipeline promise pipe composition ramda ts adt pipes result maybe either compose kleisli monet purify catamorphism chain-promise fp-libraries

tree-folding catamorphism anamorphism