How to call cb function after async function finished in loopback 3

Question

I worked at a loopback project.
Here I'm making extended api in the model.
There are many async functions.
I want to call cb function after all async functions called.
Anyone have idea to do it?

Answer 1

Use async.parallel that run function parallel and return final results.

Below example help you:

var async = require('async')


  function functionName(parameter, cb) {
        async.parallel([
          function(callback) {
              setTimeout(function() {
                  callback(null, 'one');
              }, 200);
          },
          function(callback) {
              setTimeout(function() {
                  callback(null, 'two');
              }, 100);
          }
      ],
      // optional callback
      function(err, results) {
          // the results array will equal ['one','two'] even though
          // the second function had a shorter timeout.
          if (error) {
            logger.error("ERROR FIRST SUBSCRIPTION > ", error);
            cb(error);
            return;
        }
        cb(null, {
            success: true
        });
      });
};

reference Link: async