extract-opts v5.9.0

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

npm

jspm

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

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

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

Discover how you can contribute by heading on over to the CONTRIBUTING.md file.

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