mozilla
Your Search Results

    Set.prototype

    This is an experimental technology, part of the ECMAScript 6 (Harmony) proposal.
    Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future version of browsers as the spec changes.

    Summary

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

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

    Description

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

    Properties

    Set.prototype.constructor
    Returns the function that created an instance's prototype. This is the Set function by default.
    Set.prototype.size
    Returns the number of values in the Set object.

    Methods

    Set.prototype.add(value)
    Appends a new element with the given value to the Set object. Returns the Set object.
    Set.prototype.clear()
    Removes all elements from the Set object.
    Set.prototype.delete(value)
    Removes the element associated to the value and returns the value that Set.prototype.has(value) would have previously returned. Set.prototype.has(value) will return false afterwards.
    Set.prototype.entries()
    Returns a new Iterator object that contains an array of [value, value] for each element in the Set object, in insertion order. This is kept similar to the Map object, so that each entry has the same value for its key and value here.
    Set.prototype.forEach(callbackFn[, thisArg])
    Calls callbackFn once for each value present in the Set object, in insertion order. If a thisArg parameter is provided to forEach, it will be used as the this value for each callback.
    Set.prototype.has(value)
    Returns a boolean asserting whether an element is present with the given value in the Set object or not.
    Set.prototype.keys()
    Is the same function as the values() function and returns a new Iterator object that contains the values for each element in the Set object in insertion order.
    Set.prototype.values()
    Returns a new Iterator object that contains the values for each element in the Set object in insertion order.
    Set.prototype[@@iterator]()
    Returns a new Iterator object that contains the values for each element in the Set object in insertion order.

    Specifications

    Specification Status Comment
    ECMAScript 6 (ECMA-262)
    The definition of 'Set.prototype' in that specification.
    Release Candidate Initial definition.

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support 38 13 (13) 11 25 7.1
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support Not supported 38 13.0 (13) Not supported Not supported

    iOS 8

    See also

    Document Tags and Contributors

    Contributors to this page: spacetime29, fscholz, jmdyck, arai, realityking, BlindWanderer
    Last updated by: BlindWanderer,