Method Set JavaScript

new Set() 方法

将数组传递给 new Set() 构造函数：

实例

// ƙirar Set
const letters = new Set(["a","b","c"]);

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add() 方法

实例

letters.add("d");
letters.add("e");

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如果添加相同的元素，则只会保存第一个：

实例

letters.add("a");
letters.add("b");
letters.add("c");
letters.add("c");
letters.add("c");
letters.add("c");
letters.add("c");
letters.add("c");

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列出 Set 元素

可以使用 for..of 循环列出所有 Set 元素（值）：

实例

// ƙirar Set
const letters = new Set(["a", "b", "c"]);
// dacewa daki
let text = "";
for (const x of letters) {
  text += x;
}

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has() 方法

如果指定值存在于 Set 中，has() 方法返回 true。

实例

// ƙirar Set
const letters = new Set(["a", "b", "c"]);
// Set 中是否包含 "d"？
answer = letters.has("d");

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forEach() 方法

forEach() 方法为每个 Set 元素调用一个函数：

实例

// ƙirar Set
const letters = new Set(["a", "b", "c"]);
// ƙirar dukkan shafin
let text = "";
letters.forEach(function(value) {
  text += value;
});

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values() 方法

values() 方法返回包含 Set 中值的迭代器对象：

ƙa'idodin 1

// ƙirar Set
const letters = new Set(["a", "b", "c"]);
// 获取所有值
const myIterator = letters.values();
// dacewa daki dake
let text = "";
for (const entry of myIterator) {
  text += entry;
}

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ƙa'idodin 2

// ƙirar Set
const letters = new Set(["a", "b", "c"]);
// dacewa daki dake
let text = "";
for (const entry of letters.values()) {
  text += entry;
}

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keys() methoda

keys() methoda a gana kaiyaki wani kaiyaki dake: Set kaiyaki

ƙa'idodin 1

// ƙirar Set
const letters = new Set(["a", "b", "c"]);
// dacewa kai
const myIterator = letters.keys();
// dacewa daki
let text = "";
for (const x of myIterator) {
  text += x;
}

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ƙa'idodin 2

// ƙirar Set
const letters = new Set(["a", "b", "c"]);
// dacewa daki
let text = "";
for (const x of letters.keys()) {
  text += x;
}

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entries() ƙa'idodin

entries() ƙa'idodin kanvalue, value] na ƙa'idodin.

ƙa'idodin 1

// ƙirar Set
const letters = new Set(["a", "b", "c"]);
// ƙirar dukkan shafin
const myIterator = letters.entries();
// ƙirar dukkan shafin
let text = "";
for (const entry of myIterator) {
  text += entry;
}

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ƙa'idodin 2

// ƙirar Set
const letters = new Set(["a", "b", "c"]);
// ƙirar dukkan shafin
let text = "";
for (const entry of letters.entries()) {
  text += entry;
}

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ƙa'idodin kan Set na ƙirar

Don nuna ƙirar a kai, ƙara ziyarar:JavaScript Set ƙa'idodin.

Wannan ƙa'idodin ya ƙawata ƙirar da ƙa'idodin da kuma ƙa'idodin na Set, da kuma ƙa'idodin.