Set() constructor

Set 构造函数能让你创建 Set 对象，其可以存储任意类型的唯一值，无论是 primitive values 或者对象引用。

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

Syntax

new Set([iterable])

Parameters

iterable 可选

如果传递一个可迭代对象，它的所有元素将不重复地被添加到新的 Set中。

如果不指定此参数或其值为null，则新的 Set为空。

Return value

A new Set object.

Examples

Using the Set object

let mySet = new Set()

mySet.add(1)           // Set [ 1 ]
mySet.add(5)           // Set [ 1, 5 ]
mySet.add(5)           // Set [ 1, 5 ]
mySet.add('some text') // Set [ 1, 5, 'some text' ]
let o = {a: 1, b: 2}
mySet.add(o)

Specifications

Browser compatibility

See also

• Set