Removing Objects from Array in Async Functions

Question

Please advise if the following code is the best way to remove an object from an array while performing async functions:

// arr1 holds objects that I've already pulled from the remote db in the past
const arr1 = [ { "hi": "there", "bye": "now" }, ... ]

const conn = connectToRemoteDB()

// loop through list of type of things that I want to pull from remote db
for (const x in listOfObjects)
{
  // this is async
  conn.execute(sql)
    .then (result => 
    {
      let exists = false
      // loop on arr1. can be thousands of objects
      for (const i in arr1)
        if (result.id === arr1[i].id)
        {
          exists = true
          arr1.splice(i, 1)
          break
        }
    }
}

// will this always be accurate so
// I know anything left in arr1 has been removed from the remote DB

Answer 1

I couldn't find a great way to do this so I went with a more synchronous approach using Promise.allSettled.

// oldObjects holds objects that I've already pulled from the remote db in the past
const oldObjects = [{ "hi": "there", "bye": "now" }]
const newObjects = []

const conn = connectToRemoteDB()

let dataPromises = []

// loop through list of type of things that I want to pull from remote db
for (const x in listOfObjects)
{
    // this is async
    dataPromises.push(conn.execute(sql))

}

Promise.allSettled(dataPromises)
    .then(results => 
    {
        results.forEach(({ status, value }) => 
        {
            if (status === "fulfilled")
            {
                for (const r in rows)
                {
                    const queryRow = rows[r]
                    // loop on oldObjects. can be thousands of objects
                    for (const i in oldObjects)
                        if (queryRow.id === oldObjects[i].id)
                        {
                            newObjects.push(queryRow.id)
                            break
                        }
                }
            }
        })

        // compare oldObjects and newObjects to find which objects are no longer in the DB
    })

I used Promise.allSettled because the dataPromises results in Arrays of Arrays of Objects.