Take data out of a function

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Take data out of a function

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#1 by (3 votes)

2

Good, I need to get the variable "users" of this function and the for loop, I thought about using promises but I'm new with that and I can not find the round

  var ids = [
    "RtSG7NApoda9ycDRd7vm",
    "TnT9XOXnkD1Ra5ROJERR",
    "55fAOlOlejE3v0EUU4z9"
   ];

   var users = [];



 for(var i = 0; i < ids.length; i++){
  getData(ids[i]).then(function (data) {
   users.push(data);
  });
 }

nodejs promesas function

asked by Santiago D'Antuoni 23.01.2018 в 22:04

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1 answer

Can it be verified in DB if it is equal to a string? Insert a label to all the labels that have a class in specific

score 3 · Accepted Answer

In this case it is necessary to make a tail of promises, using the method all of class Promise .

Documentation Promise.all ()

To perform the procedure you need the following:

var ids = [1, 2, 3];

// Multiples datos
var data = function (ids) {
  var promises = [];

  for(var i = 0; i < ids.length; i++) {
    promises.push(getData(ids[i]));
  }

  return Promise.all(promises);
}

// Ejecutar
data(ids).then(function (users) {
  console.log('Data:', users);
}, function (reason) {
  console.error('Exception', reason);
});

In the event that any included promise returns by reject() the Promise.all() will enter the second callback of then() and will show the reason why it was not executed correctly.