extract-opts

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

Extract Options & Callback


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

  • Install: npm install --save extract-opts
  • Use: require('extract-opts')
    • Install: npm install --save extract-opts
    • Use: require('extract-opts')
    • CDN URL: //wzrd.in/bundle/extract-opts@3.2.0
      • Install: ender add extract-opts
      • Use: require('extract-opts')
      • var extractOptsAndCallback = require('extract-opts')
        var log = console.log.bind(console)
         
        // fs.readFile(filename, [options], callback) 
        var readFile = function(filenameoptsnext){
        // 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 
        extractOptsAndCallback = require('extract-opts')
        log = console.log.bind(console)
         
        # fs.readFile(filename, [options], callback) 
        readFile = (filename, opts, next) ->
        # Extract options and callback 
        [optsnext] = extractOptsAndCallback(optsnext)
         
        # Forward for simplicities sake 
        require('fs').readFile(filenameoptsnext)
         
        # Test it 
        readFile('package.json'log)          # works with no options 
        readFile('package.json'nulllog)    # works with null options 
        readFile('package.json'{next:log})   # works with just options 

        Extract Options and Callback also supports a third argument for custom configuration.

        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:

        extractOptsAndCallback = (opts, next, config={}) ->
        config.completionCallbackNames ?= ['next''complete''done']
        return require('extract-opts')(optsnextconfig)
        log = console.log.bind(console)
         
        # 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 compeltion callback name 
        readFile('package.json'{done:log})        # works with our custom compeltion 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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        These amazing people have contributed code to this project:

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

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