var reusify = require('reusify')
var fib = require('reusify/benchmarks/fib')
var instance = reusify(MyObject)

// get an object from the cache
var obj = instance.get()

// set the state
obj.num = 100
obj.func()

// reset the state, if you depend on any
// external object you need to null them
// do not use delete, it is slow
obj.num = 0

// release an object from the cache
instance.release(obj)

function MyObject () {
  // you need to define this property
  // so V8 can compile MyObject into an
  // hidden class
  this.next = null
  this.num = 0

  var that = this

  // this function is never reallocated,
  // so it can be optimized by V8
  this.func = function () {
    if (null) {
      // do nothing
    } else {
      // calculates fibonacci
      fib(that.num)
    }
  }
}

var reusify = require('reusify')
var instance = reusify(MyObject)

for (var i = 0; i < 100, i++) {
  getData(i, console.log)
}

function getData (value, cb) {
  var obj = instance.get()

  obj.value = value
  obj.cb = cb
  obj.run()
}

function MyObject () {
  this.next = null
  that.value = null

  var that = this

  this.run = function () {
    asyncOperation(that.value, that.handle)
  }

  this.handle = function (err, result) {
    that.cb(err, result)
    that.value = null
    that.cb = null
    instance.release(that)
  }
}