generateDataPoints: function (iterable, source, arg) {
  let pairs = []
  let prevTime = 0
  for (let index in iterable) {
    let event = iterable[index]
    getTime(event.valueOf()).then(function (time) {
      query(source[arg], event.valueOf()).then(function(val) {
        if (time !== prevTime) {
          prevTime = time
          pairs.push([time, val])
          console.log(pairs) // This works as expected but only happens after the program returns
        } else {
          Promise.resolve()
        }
      })
    })
  }
  return Promise.resolve(pairs)
}