Callback hell in nodejs?

Question

In below code am I in callbackhell? How to overcome such scenario without using any async modules in pure javascript?

emailCallBack(e_data, email);
if (email         


        

Answer 1

I've put another solution in my blog. It is ugly but it is the most readable thing I could do with pure javascript.

var flow1 = new Flow1(
    {
        execute_next_step: function(err) {
            if (err) {
                console.log(err);
            };
        }
    }
);

flow1.execute_next_step();

function Flow1(parent_flow) {
    this.execute_next_step = function(err) {
        if (err) return parent_flow.execute_next_step(err);
        if (!this.next_step) this.next_step = 'START';
        console.log('Flow1:', this.next_step);
        switch (this.next_step) {
            case 'START':
                this.next_step = 'FIRST_ASYNC_TASK_FINISHED';
                firstAsyncTask(this.execute_next_step.bind(this));
                break;
            case 'FIRST_ASYNC_TASK_FINISHED':
                this.firstAsyncTaskReturn = arguments[1];
                this.next_step = 'ANOTHER_FLOW_FINISHED';
                this.another_flow = new AnotherFlow(this);
                this.another_flow.execute_next_step();
                break;
            case 'ANOTHER_FLOW_FINISHED':
                this.another_flow_return = arguments[1];
                this.next_step = 'FINISH';
                this.execute_next_step();
                break;
            case 'FINISH':
                parent_flow.execute_next_step();
                break;
        }
    }
}

function AnotherFlow(parent_flow) {
    this.execute_next_step = function(err) {
        if (err) return parent_flow.execute_next_step(err);
        if (!this.next_step) this.next_step = 'START';
        console.log('AnotherFlow:', this.next_step);
        switch (this.next_step) {
            case 'START':
                console.log('I dont want to do anything!. Calling parent');
                parent_flow.execute_next_step();
                break;
        }
    }
}