// Create new entity with current world context
var ent = Ent.New();

// Create new entity in the world
var ent = Ent.New(in world);

// Create new entity in the system
var ent = Ent.New(in systemContext);

// Create new entity by world id
var ent = Ent.New(worldId);

// Destroy entity
ent.Destroy();

// Get entity's version
// Returns number of API calls with may change entity's state (Get/Remove/Set) 
ent.Version;

// Get entity's version group (use with ComponentGroup attribute)
// Returns number of API calls which may change entity's state (Get/Remove/Set) for components having this groupId
ent.GetVersion(groupId);

// Clone entity
var clone = ent.Clone();

// Clone entity with hierarchy
var clone = ent.Clone(true);

// Copy entity
ent.CopyFrom(sourceEntity);

// Get entity representation as ulong
ent.ToULong();

// Find entity by ulong
new Ent(ulong);