Evented parallel task execution (todo: will add parallel for loop)

tasks.js

var EventEmitter = require('events');

function task1() {
  var taskName = 'task1';
  console.log(taskName, this.tasksResult);
  var result = 1;
  ee.emit('task-done', { 
    'action': taskName,
    'result': result    
  });
}

function task2() {
  var taskName = 'task2';
  console.log(taskName, this.tasksResult);
  var result = 2;
  ee.emit('task-done', { 
    'action': taskName,
    'result': result    
  });
}

function task3() {
  var taskName = 'task3';
  console.log(taskName, this.tasksResult);
  var result = 3;
  ee.emit('task-done', { 
    'action': taskName,
    'result': result    
  });
}

function task4() {
  var taskName = 'task4';
  console.log(taskName, this.tasksResult);
  var result = 4;
  ee.emit('task-done', { 
    'action': taskName,
    'result': result    
  });
}

tasksList = [task1, task2, task3, task4];

module.exports.doTask1 = function(req, res) {
  ee = new EventEmitter.EventEmitter();
  var tasksResult = {};

  ee.on('task-done', function(result) {
    console.log('task-done', result);
    tasksResult[result['action']] = result['result'];
    var totalResults = Object.keys(tasksResult).length;

    if (totalResults <= tasksList.length-1) return;
    
    console.log('tasks done', tasksResult);
    finish();
  });
  
  var taskExecuteFn = function(task, t) {
    this.tasksResult = tasksResult;
    task.call(this);
  }
  
  var finish = function() {
    res.end(JSON.stringify(tasksResult));
  }

  tasksList.forEach(taskExecuteFn);
};