The Math.asinh() static method returns the inverse hyperbolic sine of a number. That is,

The setYear() method of Date instances sets the year for a specified date according to local time.

The @@unscopables data property of Array.prototype is shared by all Array instances. It contains property names that were not included in the ECMAScript standard prior to the ES2015 version and that are ignored for with statement-binding purposes.

The Function() constructor creates Function objects. Calling the constructor directly can create functions dynamically, but suffers from security and similar (but far less significant) performance issues as eval(). However, unlike eval (which may have access to the local scope), the Function constructor creates functions which execute in the global scope only.

The delete() method of Map instances removes the specified element from this map by key.

The Int32Array() constructor creates Int32Array objects. The contents are initialized to 0.

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.