Assertions include boundaries, which indicate the beginnings and endings of lines and words, and other patterns indicating in some way that a match is possible (including look-ahead, look-behind, and conditional expressions).

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The drop() method of Iterator instances returns a new iterator helper object that skips the given number of elements at the start of this iterator.

The take() method of Iterator instances returns a new iterator helper object that yields the given number of elements in this iterator and then terminates.

The prototype property of GeneratorFunction.prototype is shared by all generator functions. Its value is Generator.prototype. Each generator function created with the function* syntax or the GeneratorFunction() constructor also has its own prototype property, whose prototype is GeneratorFunction.prototype.prototype. When the generator function is called, its prototype property becomes the prototype of the returned generator object.

The Iterator() constructor is intended to be used as the superclass of other classes that create iterators. It throws an error when constructed by itself.

The [Symbol.iterator]() method of Iterator instances implements the iterable protocol and allows built-in iterators to be consumed by most syntaxes expecting iterables, such as the spread syntax and for...of loops. It returns the value of this, which is the iterator object itself.

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The Object.getPrototypeOf() static method returns the prototype (i.e., the value of the internal [[Prototype]] property) of the specified object.

The Object.create() static method creates a new object, using an existing object as the prototype of the newly created object.