void RemoveDeadEntities() /ETHEntityArray

Remove all references to entities that have already been deleted from scene.

ETHEntity@ orc = SeekEntity("orc.ent");
ETHEntity@ elf = SeekEntity("elf.ent");

ETHEntityArray soldiers;
soldiers.Insert(orc);
soldiers.Insert(elf);

// deletes the orc from scene
DeleteEntity(orc);

// since orc is gone, this method will remove it from the array
soldiers.RemoveDeadEntities();

print("Number of soldiers in the array: " + soldiers.Size());

Output:

Number of soldiers in the array: 1