The push() method of Array instances adds the specified elements to the end of an array and returns the new length of the array.

The Promise.all() static method takes an iterable of promises as input and returns a single Promise. This returned promise fulfills when all of the input's promises fulfill (including when an empty iterable is passed), with an array of the fulfillment values. It rejects when any of the input's promises rejects, with this first rejection reason.

The lastIndexOf() method of TypedArray instances returns the last index at which a given element can be found in the typed array, or -1 if it is not present. The typed array is searched backwards, starting at fromIndex. This method has the same algorithm as Array.prototype.lastIndexOf().

The difference() method of Set instances takes a set and returns a new set containing elements in this set but not in the given set.

The isDisjointFrom() method of Set instances takes a set and returns a boolean indicating if this set has no elements in common with the given set.

The union() method of Set instances takes a set and returns a new set containing elements which are in either or both of this set and the given set.

The has() method of Map instances returns a boolean indicating whether an element with the specified key exists in this map or not.

The size accessor property of Set instances returns the number of (unique) elements in this set.

The delete() method of Set instances removes a specified value from this set, if it is in the set.

The byteLength accessor property of DataView instances returns the length (in bytes) of this view.