extract-opts

5.9.0 • Public • Published

Extract Options & Callback

Status of the GitHub Workflow: bevry NPM version NPM downloads
GitHub Sponsors donate button ThanksDev donate button Patreon donate button Liberapay donate button Buy Me A Coffee donate button Open Collective donate button crypto donate button PayPal donate button
Discord server badge Twitch community badge

Extract the options and callback from a function's arguments easily

Usage

var log = console.log.bind(console)
var extractOptsAndCallback = require('extract-opts')

// fs.readFile(filename, [options], callback)
function readFile(filename, opts, next) {
    // Extract options and callback
    var args = extractOptsAndCallback(opts, next)
    opts = args[0]
    next = args[1]

    // Forward for simplicities sake
    require('fs').readFile(filename, opts, next)
}

// Test it
readFile('package.json', log) // works with no options
readFile('package.json', null, log) // works with null options
readFile('package.json', { next: log }) // works with just options

Customisation

Extract Options and Callback also supports a third argument. You can use this third argument to customize the completionCallbackNames property that defaults to ['next']. This is useful if your completion callback has other names besides next. Allowing you to do the following:

var log = console.log.bind(console)
function extractOptsAndCallback(opts, next, config) {
    if (config == null) config = {}
    if (config.completionCallbackNames == null)
        config.completionCallbackNames = ['next', 'complete', 'done']
    return require('extract-opts')(opts, next, config)
}

// The readFile method as before

// Test it
readFile('package.json', { next: log }) // works the standard completion callback name
readFile('package.json', { complete: log }) // works with our custom completion callback name
readFile('package.json', { done: log }) // works with our custom completion callback name

Install

npm

  • Install: npm install --save extract-opts
  • Import: import * as pkg from ('extract-opts')
  • Require: const pkg = require('extract-opts')

jspm

<script type="module">
    import * as pkg from '//dev.jspm.io/extract-opts@5.9.0'
</script>

Editions

This package is published with the following editions:

  • extract-opts aliases extract-opts/index.cjs which uses the Editions Autoloader to automatically select the correct edition for the consumer's environment
  • extract-opts/source/index.js is ESNext source code for Node.js 6 || 8 || 10 || 12 || 14 || 16 || 18 || 20 || 21 with Require for modules
  • extract-opts/edition-browsers/index.js is ESNext compiled for web browsers with Require for modules
  • extract-opts/edition-node-4/index.js is ESNext compiled for Node.js 4 || 6 || 8 || 10 || 12 || 14 || 16 || 18 || 20 || 21 with Require for modules

History

Discover the release history by heading on over to the HISTORY.md file.

Backers

Code

Discover how to contribute via the CONTRIBUTING.md file.

Authors

Maintainers

Contributors

Finances

GitHub Sponsors donate button ThanksDev donate button Patreon donate button Liberapay donate button Buy Me A Coffee donate button Open Collective donate button crypto donate button PayPal donate button

Sponsors

  • Andrew Nesbitt — Software engineer and researcher
  • Balsa — We're Balsa, and we're building tools for builders.
  • Codecov — Empower developers with tools to improve code quality and testing.
  • Poonacha Medappa
  • Rob Morris
  • Sentry — Real-time crash reporting for your web apps, mobile apps, and games.
  • Syntax — Syntax Podcast

Donors

License

Unless stated otherwise all works are:

and licensed under:

Package Sidebar

Install

npm i extract-opts

Weekly Downloads

89,490

Version

5.9.0

License

Artistic-2.0

Unpacked Size

37.8 kB

Total Files

10

Last publish

Collaborators

  • bevryme