JS闭包上下文对象的生命周期？

html5 • • 问答

背景

我正在尝试将长生不老药的演员模型语言原语移植到 JS 中。我想出了一个解决方案（在 JS 中）来模拟receiveelixir 关键字，使用“接收器”函数和生成器。

这是一个简化的实现和演示，向您展示这个想法。

应用程序接口：

type ActorRef: { send(msg: any): void }
type Receiver = (msg: any) => Receiver
/**
 * `spawn` takes a `initializer` and returns an `actorRef`.
 * `initializer` is a factory function that should return a `receiver` function.
 * `receiver` is called to handle `msg` sent through `actorRef.send(msg)`
 */
function spawn(initializer: () => Receiver): ActorRef

演示： 

function* coroutine(ref) {
  let result
  while (true) {
    const msg = yield result
    result = ref.receive(msg)
  }
}

function spawn(initializer) {
  const ref = {}
  const receiver = initializer()
  ref.receive = receiver
  const gen = coroutine(ref)
  gen.next()

  function send(msg) {
    const ret = gen.next(msg)
    const nextReceiver = ret.value
    ref.receive = nextReceiver
  }

  return { send }
}

function loop(state) {
  console.log('current state', state)
  return function receiver(msg) {
    if (msg.type === 'ADD') {
      return loop(state + msg.value)
    } else {
      console.log('unhandled msg', msg)
      return loop(state)
    }
  }
}

function main() {
  const actor = spawn(() => loop(42))
  actor.send({ type: 'ADD', value: 1 })
  actor.send({ type: 'BLAH', value: 1 })
  actor.send({ type: 'ADD', value: 1 })
  return actor
}

window.actor = main()
以上是JS闭包上下文对象的生命周期？的全部内容。
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