ES6 - 集合 Set 方法 delete()

此函数从 Set 中删除指定的值。

语法

myMap.delete(key);

参数

• 键 − 要从 Map 中删除的元素的键

返回值

如果元素存在并被删除，则返回true；否则返回false。

示例

var set = new Set(); 
set.add(10); 
set.add(20); 
set.add(30);
console.log(`Size of Set before delete() :${set.size}`); 
console.log(`Set has 10 before delete() :${set.has(10)}`); 

set.delete(10) 
console.log(`Size of Set after delete() :${set.size}`); 
console.log(`Set has 10 after delete() :${set.has(10)}`) 

输出

Size of Set before delete() :3 
Set has 10 before delete() :true 
Size of Set after delete() :2 
Set has 10 after delete() :false