hello javascript heroes. i been suffering from this issue long time. the problem is that i'm searching inside an object using object as a key of search also using filter method. like this

let data = [
   {
    name:"Jade",
    role:"admin",
    pass:"0000"
  },
  {
    name:"Jon",
    role:"user",
    pass:"0000"
  },
  {
    name:"Adam",
    role:"user",
    pass:"0000"
  },
]

let result = data.filter((item)=>{
  return {role:"user",pass:"0000"} in item
})

i also tried

let result = data.filter((item)=>{
  return {role:"user",pass:"0000"} in {...item}
})

it always return an empty array.

please let me know if there is any way to solve this

CodePudding user response：

You cant simply compare objects using "in" operator. You can iterate the whole object and match values. Or simply match all values in objects.

**Sample **

let data = [
  {
    name: "Jade",
    role: "admin",
    pass: "0000",
  },
  {
    name: "Jon",
    role: "user",
    pass: "0000",
  },
  {
    name: "Adam",
    role: "user",
    pass: "0000",
  },
];
//1: Matching whole object
const isEqual = (user, item) => {
  return Object.entries(user).every(([key, value]) => item[key] === value);
};

let result = data.filter((item) => {
  return isEqual({ role: "user", pass: "0000" }, item);
});
console.log(result);
// 2: Matching values
const isEqua2 = (user, item) =>
  user.role === item.role && user.pass === item.pass;

let result2 = data.filter((item) => {
  return isEqua2({ role: "user", pass: "0000" }, item);
});

console.log(result2);

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CodePudding user response：

You could read up on https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes you could for exemple do and if statment of sort

CodePudding user response：

do it like that :

let result = data.filter((item)=>{
 return item.role == "user" && item.pass == "0000";
})

CodePudding user response：

I think you can cover up the case by using true/false, as your title says to check if an object exists in the data.

function check(obj, data) {
  for (let i = 0; i < data.length; i  ) {
    if (obj.name === data[i].name) {
      return true;
    }
  }
  return false;
}

In which if you try

console.log(check({ name: 'Jade', role: 'admin', pass: '0000' }, data));

would return true.