结合使用.includes和.map查找匹配值
结合使用.includes和.map查找匹配值
提问于 2018-07-27 20:20:28
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。下面是第一个数组：
var ids = [
"N06Jrz5hx6Q9bcVDBBUrF3GKSTp2",
"eLLfNlWLkTcImTRqrYnU0nWuu9P2"
]下面是user对象的一个示例：
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"
}我有一个上述对象的数组。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"
}
]因此，知道这一点后，我尝试了这样的方法：
console.log(reportIds.includes(users.map(user => user.id)));这返回了false。但是如果我尝试这样的id：
console.log(reportIds.includes('N06Jrz5hx6Q9bcVDBBUrF3GKSTp2'));它返回true。
则存在具有所述Id的对象。我手动检查了身份证。我试过这个：
console.log(reportIds.includes(['8VbBNBDrT1Z3kmyaQzy6LqskcOT2', 'N06Jrz5hx6Q9bcVDBBUrF3GKSTp2'].map(id => id)));但是这返回了false。
与此相同：
console.log(reportIds.includes(['8VbBNBDrT1Z3kmyaQzy6LqskcOT2', 'N06Jrz5hx6Q9bcVDBBUrF3GKSTp2']));那么，如何检查ids数组中有哪些I呢？
回答 1
Stack Overflow用户
回答已采纳
发布于 2018-07-27 20:23:23
为此，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);
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/51557853
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