Are nested promises normal in node.js?

Question

The problem I have been struggling with for two weeks now while learning node.js is how to do synchronous programming using node. I found that no matter how I try to do thin

Answer 1

Use async library and use async.series instead of nested chainings which looks really ugly and hard to debug/understand.

async.series([
    methodOne,
    methodTwo
], function (err, results) {
    // Here, results is the value from each function
    console.log(results);
});

The Promise.all(iterable) method returns a promise that resolves when all of the promises in the iterable argument have resolved, or rejects with the reason of the first passed promise that rejects.

var p1 = Promise.resolve(3);
var p2 = 1337;
var p3 = new Promise(function(resolve, reject) {
  setTimeout(resolve, 100, "foo");
}); 

Promise.all([p1, p2, p3]).then(function(values) { 
  console.log(values); // [3, 1337, "foo"] 
});

The Promise.resolve(value) method returns a Promise object that is resolved with the given value. If the value is a thenable (i.e. has a then method), the returned promise will "follow" that thenable, adopting its eventual state; otherwise the returned promise will be fulfilled with the value.

var p = Promise.resolve([1,2,3]);
p.then(function(v) {
  console.log(v[0]); // 1
});

https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise/all