Asynchronous JavaScript Loop & Generators?

Question

JavaScript

Hey!
I use the AdonisJS framework, whose controller methods act as generator functions.
There is a code:

* tasks() {
    let tasks = yield Task.findBy('status', 1)

    for(let task of tasks) {
      yield this.task(task)
    }
  }

It is necessary to make sure that the contents of the loop do not execute this.task synchronously, but run the loop in parallel. Question - HOW?

Answer 1

If the framework under the generators is based on promises, that is, there is an imitation of async / await, then this should help:

* tasks() {
    let tasks = yield Task.findBy('status', 1)

    let promises = []
    for(let task of tasks) {
      promises.push(this.task(task))
    }
    yield Promise.all(promises)
  }

Answer 2

javascript is a single-thread language. you will not call this.task(task) in parallel for all array elements. asynchronous does not mean that the code is executed in parallel, it is just executed in a non-blocking style. even promise.all() is not executed in parallel. to execute the code in parallel - you need to execute it in a separate thread (webworkers).