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WeakSet.prototype

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

Property attributes of WeakSet.prototype
Writable no
Enumerable no
Configurable no

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

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 36 34 (34) No support 23 No support
Ordinary object ? 40 (40) ? ? ?
Feature Chrome for Android Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support No support 34.0 (34) No support No support No support
Ordinary object ? ? 40.0 (40) ? ? ?

See also

Document Tags and Contributors

 Contributors to this page: andradei, fscholz, claudepache, realityking, teoli
 Last updated by: andradei,