cuipengfei

  function Spy(target, method) {
    var originalFunction = target[method]
    var result = {
      count: 0
    }

    target[method] = function() {
      result.count++
      return originalFunction.apply(target, arguments)
    }

cuipengfei

  function repeat(operation, num) {
    if (num <= 0) return

    operation()

    // release control every 10 or so
    // iterations.
    // 10 is arbitrary.
    if (num % 10 === 0) {
      setTimeout(function() {

cuipengfei

function repeat(operation, num) {
    if (num <= 0) {
        return num
    }
    else {
        operation()
        num--
        return num
    }
}

cuipengfei

function loadUsers(userIds, load, done) {
    var users = []
    var count = 0

    userIds.forEach(function (id) {
        load(id, function (user) {
            users[userIds.indexOf(user.id)] = user
            count++
            //can not use users.length here
            if (count == userIds.length) {

cuipengfei

  function getDependencies(mod, result) {
    result = result || []
    var dependencies = mod.dependencies || []
    Object.keys(dependencies).forEach(function(dep) {
      var key = dep + '@' + mod.dependencies[dep].version
      if (result.indexOf(key) === -1) result.push(key)
      getDependencies(mod.dependencies[dep], result)
    })
    return result.sort()
  }

cuipengfei

function curryN(fn, n) {
    function wrapper(args) {
        return function (oneArg) {
            var argsConcat = args.concat(oneArg)
            if (argsConcat.length == ( n || fn.length)) {
                return fn.apply(this, argsConcat)
            }
            return wrapper(argsConcat)
        }
    }

cuipengfei

 var q = require('q');
 var defer = q.defer();
 defer.promise.then(console.log)
 setTimeout(function() {
 	defer.resolve("RESOLVED!")
 }, 300)

cuipengfei

 var q = require('q');
 var defer = q.defer();

 defer.promise.then(null, function(err) {
 	console.log(err)
 })

 setTimeout(function() {
 	defer.reject("REJECTED!")
 }, 300)

cuipengfei

 var q = require('q');
 var defer = q.defer();
 defer.promise.then(console.log, console.log)

 defer.resolve("I FIRED")
 defer.reject("I DID NOT FIRE")

cuipengfei

 var q = require('q');
 var defer = q.defer();
 defer.promise.then(console.log)

 defer.resolve("SECOND")
 console.log("FIRST")

 //despite the promise being resolved synchronously,
 //the provided function is not executed until the next turn of the event loop.