Huge News!Announcing our $40M Series B led by Abstract Ventures.Learn More
Socket
Sign inDemoInstall
Socket

rust-result

Package Overview
Dependencies
Maintainers
1
Versions
2
Alerts
File Explorer

Advanced tools

Socket logo

Install Socket

Detect and block malicious and high-risk dependencies

Install

rust-result

Mimic Rust's `std::result`

  • 1.0.0
  • latest
  • Source
  • npm
  • Socket score

Version published
Weekly downloads
428K
increased by6.37%
Maintainers
1
Weekly downloads
 
Created
Source

rust-result.js

Mimic Rust's std::result.

Installation

npm install rust-result

Usage

var fs = require('fs');
var Result = require('./');


// If you want async just get a promise or something.
var readFile = function (path, encoding) {
  try {
    return Result.Ok(fs.readFileSync(path, encoding))
  }
  catch (ex) {
    return Result.Err(ex)
  }
}

var result = readFile(__filename);
var v, err;

if (Result.isOk(result)) {
  v = Result.Ok(result);
  console.log('got ' + v.length + ' bytes')
}
else if (Result.isErr(result)) {
  err = Result.Err(result);
  console.error('oops!', err.message)
}

result = readFile(__filename + 'I do not exist')
if (Result.isOk(result)) {
  v = Result.Ok(result)
  console.log('got ' + v.length + ' bytes')
}
else if (Result.isErr(result)) {
  err = Result.Err(result)
  console.error('oops!', err.message)
}

Documentation

type OkResult<T> : {
  v: T
}
type ErrResult<E <: Error> : {
  err: E
}

rust-result : {
  Ok: ((T) => OkResult<T>) |
    ((OkResult<T>) => T) |
    ((ErrResult<E>) => void),
  isOk: ((OkResult<T>) => true) |
    ((ErrResult<E>) => false)
  Err: ((E <: Error) => ErrResult<E>) |
    ((ErrResult<E>) => E) |
    ((OkResult<T>) => void),
  isErr: ((ErrResult<E>) => true) |
    ((OkResult<T>) => false)
}

Result.Ok

The Result.Ok function is overloaded to do one of two things. It can create a new Ok instance or it can check whether the argument is an instance of Ok

If you call Result.Ok with a plain value it will return an instance of Ok that boxes your plain value.

If you call Result.Ok with either an Err or an Ok instance then it will return undefined for the Err and return the value boxed in the Ok

Result.isOk

The Result.isOk function just checks whether the argument is an instance of Ok.

This predicate function returns true if you pass it an Ok and returns false if you pass it an Err

Result.Err

The Result.Err function is overloaded to do one of two things. It can create a new Err instance or it can check whether the argument is an instance of Err

If you call Result.Err with a plain error it will return an instance of Err that boxes your plain error.

If you call Result.Err with either an Err or an Ok instance then it will return undefined for the Ok and return the value err in the Err

Result.isErr

The Result.isErr function just checks whether the argument is an instance of Err.

This predicate function returns true if you pass it an Err and returns false if you pass it an Ok

MIT Licenced.

FAQs

Package last updated on 17 Dec 2014

Did you know?

Socket

Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.

Install

Related posts

SocketSocket SOC 2 Logo

Product

  • Package Alerts
  • Integrations
  • Docs
  • Pricing
  • FAQ
  • Roadmap
  • Changelog

Packages

npm

Stay in touch

Get open source security insights delivered straight into your inbox.


  • Terms
  • Privacy
  • Security

Made with ⚡️ by Socket Inc