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

 by   gcanti TypeScript Version: 2.13.1 License: MIT

 by   gcanti TypeScript Version: 2.13.1 License: MIT

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
Support
Quality
Quality
Security
Security
License
License
Reuse
Reuse

kandi-support Support

  • fp-ts has a medium active ecosystem.
  • It has 8995 star(s) with 473 fork(s). There are 109 watchers for this library.
  • There were 7 major release(s) in the last 6 months.
  • There are 134 open issues and 639 have been closed. On average issues are closed in 99 days. There are 34 open pull requests and 0 closed requests.
  • It has a neutral sentiment in the developer community.
  • The latest version of fp-ts is 2.13.1
fp-ts Support
Best in #Functional Programming
Average in #Functional Programming
fp-ts Support
Best in #Functional Programming
Average in #Functional Programming

quality kandi Quality

  • fp-ts has 0 bugs and 0 code smells.
fp-ts Quality
Best in #Functional Programming
Average in #Functional Programming
fp-ts Quality
Best in #Functional Programming
Average in #Functional Programming

securitySecurity

  • 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.
fp-ts Security
Best in #Functional Programming
Average in #Functional Programming
fp-ts Security
Best in #Functional Programming
Average in #Functional Programming

license 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.
fp-ts License
Best in #Functional Programming
Average in #Functional Programming
fp-ts License
Best in #Functional Programming
Average in #Functional Programming

buildReuse

  • 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.
fp-ts Reuse
Best in #Functional Programming
Average in #Functional Programming
fp-ts Reuse
Best in #Functional Programming
Average in #Functional Programming
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fp-ts Key Features

Functional programming in TypeScript

fp-ts Examples and Code Snippets

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<Error, Either<Error, T>> in FP-TS
  • Using POJOs in fp-ts
  • How do I convert this to a Point-free function
Trending Discussions on fp-ts

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<T>.

export const toOption = <T>(val: T): Option<T> => {
  return fromNullable(val);
};

The problem I'm having is, that no matter what I do, it includes undefined in the option. In somefile.tsx I have an object whose key value uses the toOption function. I need for that value to be an Option only but instead it reads the type as (property) airDate: Option<(string & Date) | undefined>

{
airDate:toOption(attributes.airDate), // (property) airDate: Option<(string & Date) | undefined>
}

Using type-guards

export const toOption = <T>(val: T): Option<T> => {
  if(typeof val == undefined) return none;
  return fromNullable(val);
};

Ternary

export const toOption = <T>(val: T): Option<T> => {
  return val ? some(val) : none;
};

Conditional

export const toOption = <T>(val: T): Option<T> => {
  if(!val) return none;
  return some(val)
};

They all yield the same type in the end: (property) airDate: Option<(string & Date) | undefined>

ANSWER

Answered 2021-Sep-13 at 18:43

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

export const toOption = <T>(val: T): Option<NonNullable<T>> => {
  return fromNullable(val);
};

But notice that there are no different between toOption and fromNullable, so if you want to use the name toOption, you could just assign the function as a value to toOption variable/const

export const toOption = fromNullable

You don't need to annotate the type because fromNullable's signature already is <A>(a: A) => Option<NonNullable<A>>

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

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).

Support

Disclaimer. Teaching functional programming is out of scope of this project, so the documentation assumes you already know what FP is.

Find more information at:

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Clone
  • https://github.com/gcanti/fp-ts.git

  • gh repo clone gcanti/fp-ts

  • git@github.com:gcanti/fp-ts.git

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