Set.prototype.delete()

delete() 方法會一個 Set 物件中移除指定元素。

嘗試一下

語法

js

mySet.delete(value);

參數'

value

要從 Set 物件中移除的值。

回傳值

true 如果成功從 Set 物件中移除;反之 false

範例

使用 delete 方法

js

var mySet = new Set();
mySet.add("foo");

mySet.delete("bar"); // Returns false. No "bar" element found to be deleted.
mySet.delete("foo"); // Returns true.  Successfully removed.

mySet.has("foo"); // Returns false. The "foo" element is no longer present.

下方展示了如何從一個 Set 中移除物件。

js

var setObj = new Set(); // Create a New Set.

setObj.add({ x: 10, y: 20 }); // Add object in the set.

setObj.add({ x: 20, y: 30 }); // Add object in the set.

// Delete any point with `x > 10`.
setObj.forEach(function (point) {
  if (point.x > 10) {
    setObj.delete(point);
  }
});

規範

Specification
ECMAScript Language Specification
# sec-set.prototype.delete

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