I tried to push into an array I just created within an object using function but it keeps returning numbers instead of the value pushed.

  const recordCollection ={
    5439: {
      albumTitle: 'ABBA Gold'
    }
  }
  function updateRecords(records, id, value){
    records[id].track = [];
    return  records[id].track.push(value)
  }
  console.log(updateRecords(recordCollection, 5439,'ABBA'));

according to my code, my result is supposed to be 'ABBA' but it keeps returning the size of the array instead