WeakSet.prototype

The WeakSet.prototype property represents the prototype for the WeakSet constructor.

Description

WeakSet instances inherit from WeakSet.prototype. You can use the constructor's prototype object to add properties or methods to all WeakSet instances.

WeakSet.prototype is itself just an ordinary object:

Object.prototype.toString.call(WeakSet.prototype); // "[object Object]"

Properties

WeakSet.prototype.constructor

Returns the function that created an instance's prototype. This is the WeakSet function by default.

Methods

WeakSet.prototype.add(value)

Appends a new object with the given value to the WeakSet object.

WeakSet.prototype.delete(value)

Removes the element associated to the value. WeakSet.prototype.has(value) will return false afterwards.

WeakSet.prototype.has(value)

Returns a boolean asserting whether an element is present with the given value in the WeakSet object or not.

WeakSet.prototype.clear()

Removes all elements from the WeakSet object.

Specifications

Specification	Status	Comment
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'WeakSet.prototype' in that specification.	Standard	Initial definition.
ECMAScript 2017 Draft (ECMA-262) The definition of 'WeakSet.prototype' in that specification.	Draft

Browser compatibility

See also

• Set.prototype
• WeakMap.prototype