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Set() æž„é€ å‡½æ•° - JavaScript

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Set() 构造函数创建 Set 对象。

const set1 = new Set([1, 2, 3, 4, 5]);

console.log(set1.has(1));
// Expected output: true

console.log(set1.has(5));
// Expected output: true

console.log(set1.has(6));
// Expected output: false

new Set()
new Set(iterable)

备注： Set() 只能用 new 构建。试图在没有 new 的情况下调用它，会抛出 TypeError。

iterable 可选

如果传入一个可迭代对象，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。

一个新的 Set 对象。

const 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' ]
const o = { a: 1, b: 2 };
mySet.add(o);

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