The code block below execute before my async await finishes

const getGroup = async (req, res) => {
  const { id } = req.params
  try {
    const group = await Group.findOne({ _id: id });    
    const groupNotesPromise = await group.group_notes.map( async (fileId) => {
      const file = await File.findById(fileId)
      return file;
    })
    const groupNotes = await groupNotesPromise.map( async (notePromise) => {
      await notePromise.then(res => console.log(res))
    })
    console.log(groupNotes)
  } catch (error) {
    console.log(err.message);
    res.status(400).json({ err: err.message });
  }
}

Hello guys, I have a function above, this is retrieving data from MongoDB.

However, I would like to know why would my console.log(groupNotes) be printed before the execution of the groupNotesPromise.map` above, as it has an await in the function.

Here is the console.log(groupNotes) and console.log(res) from the code above

[ Promise { <pending> }, Promise { <pending> } ]
{
  _id: new ObjectId("6496c645bf2bb491b931f082"),
  fileName: 'test',
  fileAwsReference: 'b4b71d06828d23d857b3611c2ce2480cf704f1fc1b9cb1879b563159631d162a',
  createdBy: new ObjectId("648bab3c8044efccc461ad1d"),
  createdIn: new ObjectId("648d7776284835591f536552"),
  __v: 0
}
{
  _id: new ObjectId("6496c9fafb91e60683fc812d"),
  fileName: 'waeewaea',
  fileAwsReference: '0e1f17f127f9a12a9e27d765bda1436297f0d58eb7d20f3e9dc8d39e64b58c5b',
  createdBy: new ObjectId("648bab3c8044efccc461ad1d"),
  createdIn: new ObjectId("648d7776284835591f536552"),
  __v: 0
}

>Solution :

The reason why console.log(groupNotes) is printed before the execution of groupNotesPromise.map is because you are using await inside the map callback function, but you are not waiting for the entire array of promises to resolve before logging the result.

const groupNotes = await groupNotesPromise.map(async (notePromise) => {
  await notePromise.then(res => console.log(res))
})

If you want to wait for all the promises to resolve before logging the result, you can use Promise.all()

const groupNotes = await Promise.all(groupNotesPromise);