How do I implement a nested callback pattern peroperly in Javascript

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I'm trying to build a scraper using Node.js where I need some help implementing the callback pattern properly.

I'm having trouble implementing it the right what. What I am looking to do is something like this

var client = function(){};

client.prototype.init = function() {
  // do something
  this.A();
}

client.prototype.A = function(callback) {
  // do something
  // run callback

  if(recursive_condition_fulfilled)
    myclient.A(callback)
}


var myClient = new client();

var myCallback = function(callback){
  // do something
}

myClient.init(myCallback)

The problem arises when I have an async function B() which runs inside A()

client.prototype.A = function(callback) {
  // do something

  this.B();

  // wait for B
  // once B is done
  // run callback()

  // then run the following
  if(recursive_condition_fulfilled)
    myclient.A(callback)
}


client.prototype.B = function(callback) {
  // do something
  // run callback

  if(recursive_condition_fulfilled)
    myclient.A(callback)
}

How do I implement the later promises part? where it says

// wait for B  
// once B is done  
// run callback()  

asked 29 secs ago

Atif Mohammed Ameenuddin

4,138

How do I implement a nested callback pattern peroperly in Javascript