CODEWITHSUNDEEP
javascriptnode.jsexpress
TheNormalPerson
TheNormalPerson

Reputation: 591

mapping an array returns unresolved promises

I have an array of values, and for each value i want to return an object that uses that value in a promise, i have the following code:

  const arr= serieses.map(async x => {
    const seriesId = await getSeriesIDFromName(x);
    return { part_id: partID, door_series_id: seriesId[0]["id"] };
  });

when i print arr after it all finished i get this

[
  Promise { <pending> },
  Promise { <pending> },
  Promise { <pending> },
  Promise { <pending> },
  Promise { <pending> },
  Promise { <pending> }
]

But if i print each value before the return statment, i get what i need,

{ part_id: 1, door_series_id: 1 }
{ part_id: 1, door_series_id: 12 }
{ part_id: 1, door_series_id: 15 }
{ part_id: 1, door_series_id: 16 }
{ part_id: 1, door_series_id: 8 }
{ part_id: 1, door_series_id: 6 },

how do i get arr to holed those values, and the the promise object?

Upvotes: 0

Views: 457

Answers (1)

Shridhar Sharma
Shridhar Sharma

Reputation: 2385

You should use Promise.all() for resolving all the promises in array, like this

const arr = serieses.map(async x => {
    const seriesId = await getSeriesIDFromName(x);
    return {part_id: partID, door_series_id: seriesId[0]["id"]};
});

const results = await Promise.all(arr)

results will contain an array with the values resolved from each promise

Upvotes: 4

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