将.includes与.map一起使用可查找匹配的值

Question

我正在尝试测试一个数组是否包含另一个数组中存在的id。这是第一个阵列：

var ids = [
"N06Jrz5hx6Q9bcVDBBUrF3GKSTp2",
"eLLfNlWLkTcImTRqrYnU0nWuu9P2"
]

下面是一个用户对象的示例：

var userExample = {
"category": "Chemia",
"coins": 100,
"friends": {},
"level": "Liceum",
"newAnswers": false,
"nickname": "czainusek",
"notifications": true,
"safety": true,
"tagID": "drawable/icon_other1",
"tasksUploaded": 0,
"works": {
"-LI1z-yO4MJnPwrdwHGl": "-LI1z-tB6EpqIhJwzchP",
"-LIHAwCpc84UQqGeT1bU": "-LIHAw8RuTZxfgz0ef8G",
"-LIHB2Ov5B-4XqpM79Av": "-LIHB2IPmMqOxa3UPFxs"
},
"id": "Nqez1dKRJ6aEpOb4BuUOK75iJoJ2"
}

我有一组上述物体。它们看起来都是这样的：

var usersExamples = [
{
"category": "Chemia",
"coins": 100,
"friends": {},
"level": "Liceum",
"newAnswers": false,
"nickname": "czainusek",
"notifications": true,
"safety": true,
"tagID": "drawable/icon_other1",
"tasksUploaded": 0,
"works": {
"-LI1z-yO4MJnPwrdwHGl": "-LI1z-tB6EpqIhJwzchP",
"-LIHAwCpc84UQqGeT1bU": "-LIHAw8RuTZxfgz0ef8G",
"-LIHB2Ov5B-4XqpM79Av": "-LIHB2IPmMqOxa3UPFxs"
},
"id": "Nqez1dKRJ6aEpOb4BuUOK75iJoJ2"
},
{
"coins": 20,
"friends": {},
"level": "Gimnazjum",
"newAnswers": false,
"nickname": "Tomasz ",
"notifications": true,
"safety": true,
"tagID": "drawable/emot_icons1",
"tasksUploaded": 5,
"id": "SAlVGjXIagdDuJrHYO4i6LwzUql2"
}
]

所以知道这一点，我尝试了这样的东西：

console.log(reportIds.includes(users.map(user => user.id)));

返回false。但如果我尝试这样的id：

console.log(reportIds.includes('N06Jrz5hx6Q9bcVDBBUrF3GKSTp2'));

它返回true。

具有所述Id的对象存在。我手动检查了ID。我试过这个：

console.log(reportIds.includes(['8VbBNBDrT1Z3kmyaQzy6LqskcOT2', 'N06Jrz5hx6Q9bcVDBBUrF3GKSTp2'].map(id => id)));

但这是错误的。

与此相同：

console.log(reportIds.includes(['8VbBNBDrT1Z3kmyaQzy6LqskcOT2', 'N06Jrz5hx6Q9bcVDBBUrF3GKSTp2']));

那么，我如何检查ids数组中有哪些ID呢？

Answer 1

您可以使用Array#filter和Array#includes的组合：

let ids = [
"N06Jrz5hx6Q9bcVDBBUrF3GKSTp2",
"eLLfNlWLkTcImTRqrYnU0nWuu9P2"
];
let usersExamples = [
{
"id": "Nqez1dKRJ6aEpOb4BuUOK75iJoJ2"
},
{
"id": "SAlVGjXIagdDuJrHYO4i6LwzUql2"
},
{
"id": "eLLfNlWLkTcImTRqrYnU0nWuu9P2"
}
];
let result = usersExamples.filter(u => ids.includes(u.id));
console.log(result);