Question

我在for循环内有for循环...，我的数组输出是嵌套数组cameraManager = new CameraManager(this); etNotice = findViewById(R.id.point_c_notice); getValidations().add(new TextEmptyValidation(this, etNotice)); etNotice.addTextChangedListener(getLastValidation()); tiAddress = findViewById(R.id.point_c_address); tiTel = findViewById(R.id.point_j_tel); tiTel.setAutoLinkMask(Linkify.PHONE_NUMBERS); tiTel.setMovementMethod(new ScrollingMovementMethod());，但我需要 [[{...}]]

在这种情况下，有什么方法可以使这个数组没有嵌套数组吗？

这是我的代码... 我有用户，每个用户我都需要添加新的对象数组

[{...}]

用户可以扮演多个角色，但是由于数据库结构的原因，我需要在用户对象中发送带有对象的数组

users = [{
  name: "user1"
  role: ["admin", "tester", "viewer"]
  },{
  name: "user2"
  role: ["admin", "tester", "viewer"]
  }]

userRole: any[]=[];


for (let user of users){
 for (let u of user.role){
     this.userRole.push({
         name: user.name,
         role: u
     }) 
    }
    this.data.push(this.userRole) 
   }

但是我明白了

{ "name": "user1",
   "role": [{
        "role" : "admin",
        "user" : "user1"
       },{
        "role" : "tester",
        "user" : "user1"
       },{
        "role" : "view",
        "user" : "user1"
       }]
  }

我尝试使用{ "name": "user1", "role": [ // nested array [{ "role" : "admin", "user" : "user1" },{ "role" : "tester", "user" : "user1" },{ "role" : "view", "user" : "user1" }] ] }，但还是一样

Answer 1

您可以简单地使用两个map

let users = [{name: "user1",role: ["admin", "tester", "viewer"]}, {name: "user2",role: ["admin", "tester", "viewer"]}]

let final = users.map(({name,role})=>{
  return {
    name,
    role: role.map(user=>({name,user}))
  }
})

console.log(final)

要使您的代码正常工作，您需要定义两个变量，一个变量保存最终值，另一个变量保存userRole，用于特定用户，

const users = [{name: "user1",role: ["admin", "tester", "viewer"]}, {name: "user2", role: ["admin", "tester", "viewer"]}]
const final = []

for (let user of users) {
  const userRole = [];
  for (let u of user.role) {
    userRole.push({
      name: user.name,
      role: u
    })
  }
  final.push({name:user.name, role: userRole})
}

console.log(final)

Answer 2

我对您的代码进行了一些更改。您正在创建新角色的每个循环中，我都认为this.data是一个userRole数组？因此，您可以将其添加到数据数组的每个循环中。

for (let user of users){
 for (let u of user.role){
     const userRole= { name: user.name, role: u};
     this.userRole.push(userRole);
     this.data.push(userRole) 
  }
}

Answer 3

请使用flatMap：

var data = { "name": "user1",
            "role": [  // nested array
             [{
            "role" : "admin",
            "user" : "user1"
           },{
            "role" : "tester",
            "user" : "user1"
           },{
            "role" : "view",
            "user" : "user1"
           }]
           ]
          };
          
          
          
          data.role =   data.role.flatMap(data => data);          
          console.log("print data object");
          console.log(data)

Answer 4

c:>  rman user/password@mydb
rman> backup database plus archivelog delete all input;
rman> quit

Answer 5

为什么不在第二个for循环中使用“ u”来添加角色数组？

Answer 6

这就是答案，@@ CodeManiac用户，他给了我一种思考的方式...

我需要将项目推入第二个for-loop ...，现在一切正常，如我所料

for (let user of users){
  for (let u of user.role){
     this.data.push(name: user.name, role: u) 
 }
}

在循环内部循环-嵌套数组

6 个答案: