fp-ts | Functional programming in TypeScript | Functional Programming library

by gcanti TypeScript Version: 3.0.0-alpha.26 License: MIT

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | fp-ts Summary

fp-ts is a TypeScript library typically used in Programming Style, Functional Programming applications. fp-ts has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

Functional programming in TypeScript

Support

Quality

Security

License

Reuse

Support

fp-ts has a medium active ecosystem.

It has 9532 star(s) with 488 fork(s). There are 107 watchers for this library.

It had no major release in the last 12 months.

There are 142 open issues and 647 have been closed. On average issues are closed in 120 days. There are 32 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of fp-ts is 3.0.0-alpha.26

Quality

fp-ts has 0 bugs and 0 code smells.

Security

fp-ts has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

fp-ts code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

fp-ts is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

fp-ts releases are available to install and integrate.

Installation instructions, examples and code snippets are available.

It has 30 lines of code, 0 functions and 264 files.

It has low code complexity. Code complexity directly impacts maintainability of the code.

Top functions reviewed by kandi - BETA

kandi's functional review helps you automatically verify the functionalities of the libraries and avoid rework.
Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of fp-ts

Get all kandi verified functions for this library.

fp-ts Key Features

No Key Features are available at this moment for fp-ts.

fp-ts Examples and Code Snippets

No Code Snippets are available at this moment for fp-ts.

Community Discussions

Trending Discussions on fp-ts

fp-ts Option, Typescript and undefined

merging 2 TaskEither in fp-ts

Cannot fix error Types of parameters 'r' and 'a' are incompatible

TypeScript: implementing pipe function using tuple

Generically extract a value from typed Record

How to extract value type from object and keys in typescript

How to test TaskEither form fp-ts with jest

How to flatten TaskEither> in FP-TS

Using POJOs in fp-ts

How do I convert this to a Point-free function

QUESTION

fp-ts Option, Typescript and undefined

Asked 2022-Mar-17 at 14:49

I'm trying to create a simple helper function using fp-ts/Option and Typescript that takes a an arbitrary value and returns it as an Option.

...

ANSWER

Answered 2021-Sep-13 at 18:43

The typescript utility type NonNullable comes in handy at times like this.

Source https://stackoverflow.com/questions/68960556

QUESTION

merging 2 TaskEither in fp-ts

Asked 2022-Mar-17 at 14:45

I am working on a project that using fp-ts

I have 2 TaskEither object like TaskEither, TaskEither

I wanted to merging this objects contents and create new TaskEither,
Example A object = {a: 123, b: 456, c: 0}

Example B object = {c: 789}

I wanted to create newObject: TaskEither

and If everything goes well, expecting value should be {a: 123, b: 456, c: 789 }

...

ANSWER

Answered 2021-Dec-01 at 07:47

I would recommend to use the Do-Notation in this case. Here an example.

Source https://stackoverflow.com/questions/70174986

QUESTION

Cannot fix error Types of parameters 'r' and 'a' are incompatible

Asked 2022-Mar-16 at 01:49

I try to replicate this code from this blog, but running into some pretty obscure errors

...

ANSWER

Answered 2022-Mar-16 at 01:49

I don't know how this code could have worked, since the result of sequenceS has a constraint >>, which cannot be met by an interface due to possible declaration merging (see this TypeScript issue, for example). And that constraint was already present in 2019, which is way before the blog post was written.

Anyhow, you can get the example to work by declaring OrderHKD as a type rather than an interface:

Source https://stackoverflow.com/questions/71490052

QUESTION

TypeScript: implementing pipe function using tuple

Asked 2022-Mar-11 at 15:05

Playground Link

I am implementing a pipe function but with one difference from regular implementations: rather than taking functions as arguments, it must accept an array of functions passed as a single argument.

Like most implementations, my pipe implementation captures the input and output types of each function using type varaibles.

...

ANSWER

Answered 2022-Mar-11 at 15:05

This appears not to be possible currently (v4.6).

Meta-issue: Use Full Unification for Generic Inference? #30134 tracks the overarching problem.

This comment may shed light on the mechanism TS uses to infer in this scenario.

Source https://stackoverflow.com/questions/70462222

QUESTION

Generically extract a value from typed Record

Asked 2022-Mar-09 at 19:49

I am using fp-ts and in this case, Options. Lets say I have an example type:

...

ANSWER

Answered 2022-Mar-09 at 19:49

You can extract the type of the option using a conditional type. You can then use a generic function to capture the type of the record type (lets call it T), and the type of the key (lets call it K). With this information you can then create the required type, by omitting K from T and intersecting it with the an object type that contains just K with the type of the option:

Source https://stackoverflow.com/questions/71413045

QUESTION

How to extract value type from object and keys in typescript

Asked 2022-Feb-28 at 13:12

I am using arg and fp-ts. I want to have a function that returns type based on one of the inputs key value.

...

ANSWER

Answered 2022-Feb-28 at 13:12

I couldn't make it work with arg library. But I was able to extract type with command-line-args

Source https://stackoverflow.com/questions/71274825

QUESTION

How to test TaskEither form fp-ts with jest

Asked 2022-Feb-28 at 13:07

I am new to fp-ts. Let's say I have a function (path: string) => TaskEither which reads and parses config, and I want to write a test for that.

So far I have:

...

ANSWER

Answered 2022-Feb-28 at 13:07

I was missing function call.

It should have been:

Source https://stackoverflow.com/questions/71243594

QUESTION

How to flatten TaskEither> in FP-TS

Asked 2022-Feb-23 at 17:15

I am new to fp-ts. I am used to scala for comprehensions when dealing with combining Either, IO and ... The question is, let's say we have function with signatures

...

ANSWER

Answered 2022-Feb-23 at 17:15

One way to go about this is to simply pick TaskEither as your monad of choice, and lift everything else into it.

Source https://stackoverflow.com/questions/71232280

QUESTION

Using POJOs in fp-ts

Asked 2022-Feb-14 at 08:49

I want to do what I think is the simplest thing, map through a plain old Javascript object, using fp-ts constructs.

There are a lot of operators I would like to use — map, filterMap, and so on — but they seem to require the Map type (which I assume is the Javascript Map object) — and there does not seem to be any easy way to convert back and forth between Map and Javascript object, which in Typescript is the standard representation of algebraic data types and of its Record type.

This seems like a pretty big hole. Please don’t tell me I have to switch to lodash...

...

ANSWER

Answered 2022-Feb-14 at 08:49

fp-ts/Record lets you work with Record as if they were a Functor in V, so you can have

Source https://stackoverflow.com/questions/71097817

QUESTION

How do I convert this to a Point-free function

Asked 2022-Feb-12 at 05:13

import { chain, map, Apply } from "fp-ts/lib/IO";
import { log } from "fp-ts/lib/Console";
import { pipe } from "fp-ts/lib/function";
import * as D from "fp-ts/lib/Date";
import { sequenceT } from "fp-ts/lib/Apply";
import { v4 as uuidv4 } from "uuid";

export const Article = (title: string) =>
  ([id, now]: [string, Date]) => ({
    id,
    title,
    createdAt: now
  });

const createArticle = (title: string) =>
  pipe(sequenceT(Apply)(uuidv4, D.create), map(Article(title)));

const program = pipe(
  createArticle("hello"),
  chain(log)
);

program();

...

ANSWER

Answered 2022-Feb-12 at 05:13

You can do the piping in reverse by applying the values to the function using ap. I had to create a function that helps TypeScript figure out the type of of.

Source https://stackoverflow.com/questions/71082006

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install fp-ts

To install the stable version:. Make sure to always have a single version of fp-ts installed in your project. Multiple versions are known to cause tsc to hang during compilation. You can check the versions currently installed using npm ls fp-ts (make sure there's a single version and all the others are marked as deduped).