Generator

The Generator object is returned by a generator function and it conforms to both the iterable protocol and the iterator protocol.

Generator is a subclass of the Iterator class.

There’s no JavaScript entity that corresponds to the Generator constructor. Instances of Generator must be returned from generator functions:

There’s only a hidden object which is the prototype object shared by all objects created by generator functions. This object is often stylized as Generator.prototype to make it look like a class, but it should be more appropriately called GeneratorFunction.prototype.prototype, because GeneratorFunction is an actual JavaScript entity. To understand the prototype chain of Generator instances, see GeneratorFunction.prototype.prototype.