blocks|key|1317831|text|如果你只想访问简单的联合和交集函数，你也可以尝试Underscore.js内置的数组函数，它还提供了许多更有用的数据操作工具，如果你还没有，可以试试。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1317832|entityMap|0|LINK|mutability|MUTABLE|url|http://documentcloud.github.com/underscore/^0|O|D|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

If you just want to have access to simple union, intersection functions, you could also try <a href="http://documentcloud.github.com/underscore/" rel="noreferrer">Underscore.js</a>'s built-in Array functions. It also provides a lot of more useful utilities for data manipulation, so try it if you haven't.

blocks|key|1102965|text|查看setjs。API提供了基本的操作，并且库在设计上是不可变的。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1102966|免责声明:我是作者。|1102967|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/bebraw/setjs^0|2|5|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

Check out <a href="https://github.com/bebraw/setjs" rel="nofollow">setjs</a>. The API provides basic operations and the library is immutable by design.

Disclaimer: I'm the author.

blocks|key|1317953|text|Set现在在ES2015中是原生的。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1317954|let+a+=+new+Set([1,2,3]);
let+b+=+new+Set([1,2,4]);
let+intersect+=+new+Set([...a].filter(i+=>+b.has(i)));
let+union+=+new+Set([...a,+...b]);|code-block|syntax|javascript|1317955|这适用于使用babel的转译，或者仅在火狐中原生使用。|1317956|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Set|1|https://babeljs.io/^0|6|6|0|0|0|6|5|1|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

Sets are now native in <a href="https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Set" rel="nofollow">ES2015</a>.

<pre><code>let a = new Set([1,2,3]);
let b = new Set([1,2,4]);
let intersect = new Set([...a].filter(i =&gt; b.has(i)));
let union = new Set([...a, ...b]);
</code></pre>

This works with transpiling using <a href="https://babeljs.io" rel="nofollow">babel</a> or just natively in firefox.

blocks|key|1318022|text|immutable-js公开了一个强大set数据结构。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1318023|您可以在work+here中看到一个简单的node.js示例。|1318024|im+=+require("immutable")

const+mySet+=+im.Set([1,+"a",+{value:+Symbol()}])

//+the+.add+and+.delete+methods+do+not+modify+mySet,+but+return+a+new+set+instance+instead.
const+newSet+=+mySet
++++++++++++++++.add(42)
++++++++++++++++.delete(1)

console.info("Does+mySet+have+42?",+mySet.has(42))
console.info("Does+newSet+have+42?",+newSet.has(42))|code-block|syntax|javascript|1318025|entityMap|0|LINK|mutability|MUTABLE|url|https://facebook.github.io/immutable-js/|1|http://devdocs.io/immutable-set/|2|https://runkit.com/attilavm/immutable-js-set-example^0|0|C|0|J|3|1|0|9|4|2|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]|$A|10|B|11|1|12]]|C|$]]|$1|D|3|E|5|6|7|13|8|@]|9|@$A|14|B|15|1|16]]|C|$]]|$1|F|3|G|5|H|7|17|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|18|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]|U|$5|N|O|P|C|$Q|V]]]]

<a href="https://facebook.github.io/immutable-js/" rel="nofollow noreferrer">immutable-js</a> expose a powerfull <a href="http://devdocs.io/immutable-set/" rel="nofollow noreferrer">set</a> data-structure. 

A simple example for node.js, which you can see in work <a href="https://runkit.com/attilavm/immutable-js-set-example" rel="nofollow noreferrer">here</a>.

<pre><code>im = require("immutable")

const mySet = im.Set([1, "a", {value: Symbol()}])

// the .add and .delete methods do not modify mySet, but return a new set instance instead.
const newSet = mySet
 .add(42)
 .delete(1)

console.info("Does mySet have 42?", mySet.has(42))
console.info("Does newSet have 42?", newSet.has(42))
</code></pre>

blocks|key|1318099|text|就像前面提到的，现在已经在JS上设置了。根据你的目的，你可能也会对https://github.com/fsvieira/cset感兴趣(我是它的作者)，它是一个lazzy集合库，具有常见的集合运算，包括笛卡尔乘积。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1318100|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/fsvieira/cset^0|X|W|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

like have been mention there is now Set on JS. Depending on your purposes you also may be interested on <a href="https://github.com/fsvieira/cset" rel="nofollow noreferrer">https://github.com/fsvieira/cset</a> (I am its author), its a lazzy set lib, with common set operation, including cartesian product.

Since Javascript doesn't have a built in set datatype has anyone come across a decent library for sets and set operations like union, intersection, etc?

Is there a library for a Set data type in Javascript?

数据结构

大数据

既然Javascript没有内置的set数据类型，有没有人遇到过一个像样的集合和集合操作库，比如并集、交集等？

问Javascript中是否有用于设置数据类型的库？
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