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Showing content from https://developer.mozilla.org/zh-TW/docs/Web/JavaScript/Reference/Global_Objects/Set/add below:

Set.prototype.add() - JavaScript | MDN

Baseline Widely available

add() 會在一個 Set 物件的尾端加上一個指定 value 的新元素。

const set1 = new Set();

set1.add(42);
set1.add(42);
set1.add(13);

for (const item of set1) {
  console.log(item);
  // Expected output: 42
  // Expected output: 13
}

value

要被加到 Set 物件中的值。

Set 物件本身。

var mySet = new Set();

mySet.add(1);
mySet.add(5).add("some text"); // chainable

console.log(mySet);
// Set [1, 5, "some text"]

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