A collection of unique values that may be of any type.
Syntax
setObj = new Set()
Remarks
If you try to add a non-unique value to a Set, the new value will not be added to the collection.
Properties
The following table lists the properties of the Set object.
| Property | Description |
|---|---|
| constructor | Specifies the function that creates a set. |
| prototype | Returns a reference to the prototype for a set. |
| size | Returns the number of elements in a set. |
Methods
The following table lists the methods of the Set object.
| Method | Description |
|---|---|
| add | Adds an element to a set. |
| clear | Removes all elements from a set. |
| delete | Removes a specified element from a set. |
| forEach | Performs the specified action for each element in a set. |
| has | Returns true if the set contains a specified element. |
| toString | Returns a string representation of a set. |
| valueOf | Returns the primitive value of the specified object. |
Example
The following example shows how to add members to a set and then retrieve them.
var s = new Set();
s.add("Thomas Jefferson");
s.add(1776);
s.add("founding father");
s.forEach(function (item) {
document.write(item.toString() + ", ");
});
// Output:
// Thomas Jefferson, 1776, founding father,
Requirements
Supported in the Internet Explorer 11 standards document mode. Also supported in Store apps (Windows 8.1 and Windows Phone 8.1). See Version Information.
Not supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards. Not supported in Windows 8.