clear method

void clear()

Drops every entry while keeping the allocated capacity.

Implementation

void clear() {
  _slots.fillRange(0, _slots.length, 0);
  _keysUsed = 0;
  _count = 0;
  _heads.fillRange(0, _heads.length, -1);
  for (final level in _levels) {
    level.fillRange(0, level.length, -1);
  }
  _topLevel = 0;
}