7/3/2020 · fp-ts meets if, else and switch (2 Part Series) 1 Option: fp-ts 2 Either: fp-ts. Photo by Tom Morel on Unsplash, show him some love! Introduction I’ve fallen in love with fp-ts and the ecosystem. Once the main concepts are grasped and the code starts to flow, life is bliss. … And in my opinion such comparission would look bad for your fp-ts …
9/10/2020 · If chain is unfamiliar to you, it takes a function that maps whatever the monad is holding and returns a monad of something else . In this example it is assumed we start with a ReaderTaskEither of a string userId and we chain it to a ReaderTaskEither of a Response.For more information about monads and chain in fp-ts checkout Getting started with fp-ts: Monad, Represents a value of one of two possible types (a disjoint union). An instance of Either is either an instance of Left or Right.. A common use of Either is as an alternative to Option for dealing with possible missing values. In this usage, None is replaced with a Left which can contain useful information.Right takes the place of Some.Convention dictates that Left is used for failure and …
We are using TypeScript and fp-ts to explore this paradigm, but these skills are transferrable between languages and libraries. You will learn to solve problems in a typed, functional style using composition and data types, such as Optional, Either and whatever else we find useful.
This example assumes we have fp-ts installed and pipe imported. Another nuance of pipe is the order (or lack of order) that we define our initial values. To show how this works, let’s look at a …
Linear ordering – No more jumping between if this else that or getting stuck in a deep-nested JavaScript try/catch block. Why we chose the fp-ts library # In theory, we could’ve switched out fp-ts for another functional programming library for TypeScript like Purify.
Migrate from PureScript/Haskell . This guide shows you how to use fp-ts concepts if you have prior experience with PureScript or Haskell.
