promises with step

with_step.js

// Module Dependencies
var step = require('step')
  , request = require('request')
  , inspect = require('util').inspect

// Some URLs to play with, and a queue to keep the code readable
  , urls = ['google.com', 'twitter.com', 'facebook.com']

step
  ( function() {
      var self = this

      // For each url, create a parallel step
      urls.forEach(function(url) {
        request({url: 'http://'+url}, self.parallel()) } ) }

  , function(err) {
      var results = Array.prototype.slice.call(arguments, 1)

      // handle errors
      if (err) {
        console.log("rejected "+err) }

      // print results
      console.log("fulfilled "+results.map(function(r){return inspect(r.headers)}))

      //  eh, we're done
      console.log("finally") } )