Remove duplicates from array of Mongo ObjectIDs

index.js

/**
 * Given many arrays of ObjectIDs, return a unique list
 *
 * @params objectIDs {Array<ObjectID>}
 * @returns
 */
module.exports = function dedupeIDs(objectIDs) {
  const ids = {}
  objectIDs.forEach(_id => (ids[_id.toString()] = _id))
  return Object.values(ids)
}

This really helped me once I figured out that I wasnt working with strings. Couldnt figure out why traditional methods for removing duplicates in array weren't working.

This doesn't work for me.

The first line is the log of the ObjectIDs of a property of a document that I get from the DB.
The second line is the result of a concat method in which I merge the array from line 1 with an array with another ObjectID.
The third line is the result of your function, which seemingly gives me the wrong result. 🙁