category-theory How is it possible that the default implementations of Haskell's Bifunctor first and second compose? I've been studying the category theory for about three months now. Recently, I felt surprised with the definition of Haskell's Bifunctor: class Bifunctor f where // type signatures bimap :: (a -> c) -&
typescript filter undefined and null values from an array while still satisfying TypeScript's strict null checks. In strict mode, TypeScript makes it illegal to assign an array of type (T | undefined) to an array of type T[]. This prevents bugs by preventing us from dotting into (de-referencing) an undefined
typescript Error handling with an Either type in TypeScript. type Result<T> = T | Error; const someFunc = (isError: boolean): Result<string> => { if (isError) { return new Error(); } return 'Success!'; }; const otherFunc = (isError: boolean): Result<number> =>
programming My Functional Programming Notes DRAFT These are concise, early learning functional programming notes from these sources: https://wiki.haskell.org/Typeclassopedia https://www.manning.com/books/concurrency-in-dotnet https://stackoverflow.com/a/4412319/1108891 talks about how C#
