code: func JustPressedTouchIDs() []int {
  	var ids []int
  	theInputState.m.RLock()
  	for id, s := range theInputState.touchDurations {
  		if s == 1 {
  			ids = append(ids, id)
  		}
  	}
  	theInputState.m.RUnlock()
  	sort.Ints(ids)
  	return ids
  }
docs: // JustPressedTouchIDs returns touch IDs that are created just in the current frame.
  //
  // JustPressedTouchIDs might return nil when there is not touch.
  //
  // JustPressedTouchIDs is concurrent safe.