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

The Number.isInteger() static method determines whether the passed value is an integer.

The clear() method of Map instances removes all elements from this map.

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

The forEach() method of Map instances executes a provided function once per each key/value pair in this map, in insertion order.

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

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

The get() method of WeakMap instances returns a specified element from this WeakMap.

The Float64Array typed array represents an array of 64-bit floating point numbers in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).

The GeneratorFunction object provides methods for generator functions. In JavaScript, every generator function is actually a GeneratorFunction object.