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<!-- TITLE/ --> <h1>Extract Options & Callback</h1> <!-- /TITLE --> <!-- BADGES/ --> <span class="badge-travisci"><a href="http://travis-ci.org/bevry/extract-opts" title="Check this project's build status on TravisCI"><img src="https://img.shields.io/travis/bevry/extract-opts/master.svg" alt="Travis CI Build Status" /></a></span> <span class="badge-npmversion"><a href="https://npmjs.org/package/extract-opts" title="View this project on NPM"><img src="https://img.shields.io/npm/v/extract-opts.svg" alt="NPM version" /></a></span> <span class="badge-npmdownloads"><a href="https://npmjs.org/package/extract-opts" title="View this project on NPM"><img src="https://img.shields.io/npm/dm/extract-opts.svg" alt="NPM downloads" /></a></span> <span class="badge-daviddm"><a href="https://david-dm.org/bevry/extract-opts" title="View the status of this project's dependencies on DavidDM"><img src="https://img.shields.io/david/bevry/extract-opts.svg" alt="Dependency Status" /></a></span> <span 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<h2>Install</h2> <a href="https://npmjs.com" title="npm is a package manager for javascript"><h3>NPM</h3></a><ul> <li>Install: <code>npm install --save extract-opts</code></li> <li>Module: <code>require('extract-opts')</code></li></ul> <a href="http://browserify.org" title="Browserify lets you require('modules') in the browser by bundling up all of your dependencies"><h3>Browserify</h3></a><ul> <li>Install: <code>npm install --save extract-opts</code></li> <li>Module: <code>require('extract-opts')</code></li> <li>CDN URL: <code>//wzrd.in/bundle/extract-opts@3.3.1</code></li></ul> <a href="http://enderjs.com" title="Ender is a full featured package manager for your browser"><h3>Ender</h3></a><ul> <li>Install: <code>ender add extract-opts</code></li> <li>Module: <code>require('extract-opts')</code></li></ul> <h3><a href="https://github.com/bevry/editions" title="Editions are the best way to produce and consume packages you care about.">Editions</a></h3> <p>This package is published with the following editions:</p> <ul><li><code>extract-opts</code> aliases <code>extract-opts/index.js</code> which uses <a href="https://github.com/bevry/editions" title="Editions are the best way to produce and consume packages you care about.">Editions</a> to automatically select the correct edition for the consumers environment</li> <li><code>extract-opts/source/index.js</code> is Source + <a href="https://babeljs.io/docs/learn-es2015/" title="ECMAScript Next">ESNext</a> + <a href="https://nodejs.org/dist/latest-v5.x/docs/api/modules.html" title="Node/CJS Modules">Require</a></li> <li><code>extract-opts/es2015/index.js</code> is <a href="https://babeljs.io" title="The compiler for writing next generation JavaScript">Babel</a> Compiled + <a href="http://babeljs.io/docs/plugins/preset-es2015/" title="ECMAScript 2015">ES2015</a> + <a href="https://nodejs.org/dist/latest-v5.x/docs/api/modules.html" title="Node/CJS Modules">Require</a></li></ul> <p>Older environments may need <a href="https://babeljs.io/docs/usage/polyfill/" title="A polyfill that emulates missing ECMAScript environment features">Babel's Polyfill</a> or something similar.</p> <!-- /INSTALL --> ## Usage ``` javascript 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: ``` javascript 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 ``` <!-- HISTORY/ --> <h2>History</h2> <a href="https://github.com/bevry/extract-opts/blob/master/HISTORY.md#files">Discover the release history by heading on over to the <code>HISTORY.md</code> file.</a> <!-- /HISTORY --> <!-- CONTRIBUTE/ --> <h2>Contribute</h2> <a href="https://github.com/bevry/extract-opts/blob/master/CONTRIBUTING.md#files">Discover how you can contribute by heading on over to the <code>CONTRIBUTING.md</code> file.</a> <!-- /CONTRIBUTE --> <!-- BACKERS/ --> <h2>Backers</h2> <h3>Maintainers</h3> These amazing people are maintaining this project: <ul><li><a href="https://balupton.com">Benjamin Lupton</a> — <a href="https://github.com/bevry/extract-opts/commits?author=balupton" title="View the GitHub contributions of Benjamin Lupton on repository bevry/extract-opts">view contributions</a></li></ul> <h3>Sponsors</h3> No sponsors yet! 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