angular 5, how do I return an array from a promise?

Question

I am creating an array, after it is created that array is resolved as a Object. However as I need to sort tempArray based on a particular value after the resolve I need it as an array, not an Object. Also because after the sort I am displaying it using: *ngFor. Or is it better to somehow sort the Object instead of changing it back to an array?

The console.log of the returned Promise is displayed underneath.

var tempArray = []
return new Promise((resolve, reject) => {
  let error = false;
  var i = 0;
  for (let key of arrayOfPosts) {
    tempArray[i] = {
      "_id": key._id,
      "postPub": key.postPub,
      "timePast": this.timePastPublix
    }
    i++
  }

  if (error) {
    reject('error')
  } else {
    resolve(tempArray)
  }
});

{_id: "5aba1af4c97ce42ea81893bc", postPub: "0.00", timePast: "1970-01-01T01:00:00+01:00"}
{_id: "5ac698172910d705ecd66378", postPendingPayoutPublic: "0.00", timePast: "1970-01-01T01:00:00+01:00"}

Answer 1

You can just return it as an array, no need for an Object:

var promise = new Promise((resolve, reject) => {
  resolve([1,2,3,4,5]);
});

// reject example
var promise2 = new Promise((resolve, reject) => {
  var array = [];
  if(array.length == 0)
     reject("error");
  else
     resolve(array);
});

promise.then(data => console.log(data));
promise2.then(data => console.log(data))
        .catch(error => console.log(error));

Here is a stackblitz which uses the promise array return values in an *ngFor: https://stackblitz.com/edit/angular-vpkk1a