CODEWITHSUNDEEP
javascriptjsonmethods
user8274065
user8274065

Reputation:

Make new json object by reduce key

I have searched stack overflow for about 30 minutes but I am not sure that I can use filter, map or reduce. I have the following JSON

Input

[
  {
    "_id": "5a3711070776d02ed87d2100",
    "index": 0,
    "guid": "fb08e9c3-c5b6-44e9-a4c6-73edcfbc8ae9",
    "isActive": false,
    "balance": "$2,762.54",
    "picture": "http://placehold.it/32x32",
    "age": 39,
    "eyeColor": "brown",
    "name": "Crystal Sampson",
    "gender": "female",
    "company": "ZAGGLE",
    "email": "[email protected]",
    "phone": "+1 (822) 582-2186",
    "address": "836 Batchelder Street, Harviell, Indiana, 966",
    "about": "Duis eu irure mollit sit voluptate proident do reprehenderit irure sunt irure tempor. Elit commodo mollit Lorem esse elit ea nostrud. Commodo cillum ipsum enim incididunt aliquip consectetur cillum cillum commodo et aliquip.\r\n",
    "registered": "2017-01-31T09:56:39 -07:00",
    "latitude": 18.386331,
    "longitude": -3.807078,
    "tags": [
      "laboris",
      "reprehenderit",
      "aliqua",
      "ipsum",
      "in",
      "consequat",
      "anim"
    ],
    "friends": [
      {
        "id": 0,
        "name": "Lily Mullen"
      },
      {
        "id": 1,
        "name": "Smith Howard"
      },
      {
        "id": 2,
        "name": "Ronda Stafford"
      }
    ],
    "greeting": "Hello, Crystal Sampson! You have 2 unread messages.",
    "favoriteFruit": "banana"
  }]

Output 

[{"name": "Crystal Sampson",
"gender": "female",
"company": "ZAGGLE",
"email": "[email protected]"}]

I want to reduce key that I interest. Thank you so much.

Upvotes: 0

Views: 1207

Answers (5)

Christian Hardy
Christian Hardy

Reputation: 81

Is a document from collection in MongoDB really?? Why not use projections?

If don't want use projections you have another alternative, remember, a JSON is a Object, so:

var obj = new Object(); 
obj['XKey1'] = "Value1";
obj['XKey2'] = "Value2";
obj['YKey3'] = "Value3";
obj['YKey4'] = "Value4";


Object.keys(obj).map(function(objectKey, index) {
  if(objectKey=='YKey3') delete obj[objectKey];
});

console.log(obj)

Upvotes: 0

Rush W.
Rush W.

Reputation: 1361

For your question, i have used map function to iterate over your array.

Google more about difference between map, filter and reduce. You'll get fantastic examples. And try them on your own.

var arrResult = [];

var InputObject = [{
"_id": "5a3711070776d02ed87d2100",
"index": 0,
"guid": "fb08e9c3-c5b6-44e9-a4c6-73edcfbc8ae9",
"isActive": false,
"balance": "$2,762.54",
"picture": "http://placehold.it/32x32",
"age": 39,
"eyeColor": "brown",
"name": "Crystal Sampson",
"gender": "female",
"company": "ZAGGLE",
"email": "[email protected]",
"phone": "+1 (822) 582-2186",
"address": "836 Batchelder Street, Harviell, Indiana, 966",
"about": "Duis eu irure mollit sit voluptate proident do reprehenderit irure sunt irure tempor. Elit commodo mollit Lorem esse elit ea nostrud. Commodo cillum ipsum enim incididunt aliquip consectetur cillum cillum commodo et aliquip.\r\n",
"registered": "2017-01-31T09:56:39 -07:00",
"latitude": 18.386331,
"longitude": -3.807078,
"tags": [
  "laboris",
  "reprehenderit",
  "aliqua",
  "ipsum",
  "in",
  "consequat",
  "anim"
],
"friends": [
  {
    "id": 0,
    "name": "Lily Mullen"
  },
  {
    "id": 1,
    "name": "Smith Howard"
  },
  {
    "id": 2,
    "name": "Ronda Stafford"
  }
],
"greeting": "Hello, Crystal Sampson! You have 2 unread messages.",
"favoriteFruit": "banana"}];


InputObject.map((x)=>{
    var obj = {
        "name": x.name,
        "gender": x.gender,
        "company": x.company,
        "email": x.email
    };
    arrResult.push(obj);
});

console.log(arrResult);

Upvotes: 0

Praveen Kumar Purushothaman
Praveen Kumar Purushothaman

Reputation: 167182

You can do some sort of filter like this:

var input = [{
  "_id": "5a3711070776d02ed87d2100",
  "index": 0,
  "guid": "fb08e9c3-c5b6-44e9-a4c6-73edcfbc8ae9",
  "isActive": false,
  "balance": "$2,762.54",
  "picture": "http://placehold.it/32x32",
  "age": 39,
  "eyeColor": "brown",
  "name": "Crystal Sampson",
  "gender": "female",
  "company": "ZAGGLE",
  "email": "[email protected]",
  "phone": "+1 (822) 582-2186",
  "address": "836 Batchelder Street, Harviell, Indiana, 966",
  "about": "Duis eu irure mollit sit voluptate proident do reprehenderit irure sunt irure tempor. Elit commodo mollit Lorem esse elit ea nostrud. Commodo cillum ipsum enim incididunt aliquip consectetur cillum cillum commodo et aliquip.\r\n",
  "registered": "2017-01-31T09:56:39 -07:00",
  "latitude": 18.386331,
  "longitude": -3.807078,
  "tags": [
    "laboris",
    "reprehenderit",
    "aliqua",
    "ipsum",
    "in",
    "consequat",
    "anim"
  ],
  "friends": [{
      "id": 0,
      "name": "Lily Mullen"
    },
    {
      "id": 1,
      "name": "Smith Howard"
    },
    {
      "id": 2,
      "name": "Ronda Stafford"
    }
  ],
  "greeting": "Hello, Crystal Sampson! You have 2 unread messages.",
  "favoriteFruit": "banana"
}];
console.log(input.map(function (item) {
  return {
    name: item.name,
    gender: item.gender,
    company: item.company,
    email: item.email
  };
}));

Upvotes: 0

Danmoreng
Danmoreng

Reputation: 2367

What you want to do is .map over the array and make new objects only with the keys you are interested in.

const input = [
  {
    "_id": "5a3711070776d02ed87d2100",
    "index": 0,
    "guid": "fb08e9c3-c5b6-44e9-a4c6-73edcfbc8ae9",
    "isActive": false,
    "balance": "$2,762.54",
    "picture": "http://placehold.it/32x32",
    "age": 39,
    "eyeColor": "brown",
    "name": "Crystal Sampson",
    "gender": "female",
    "company": "ZAGGLE",
    "email": "[email protected]",
    "phone": "+1 (822) 582-2186",
    "address": "836 Batchelder Street, Harviell, Indiana, 966",
    "about": "Duis eu irure mollit sit voluptate proident do reprehenderit irure sunt irure tempor. Elit commodo mollit Lorem esse elit ea nostrud. Commodo cillum ipsum enim incididunt aliquip consectetur cillum cillum commodo et aliquip.\r\n",
    "registered": "2017-01-31T09:56:39 -07:00",
    "latitude": 18.386331,
    "longitude": -3.807078,
    "tags": [
      "laboris",
      "reprehenderit",
      "aliqua",
      "ipsum",
      "in",
      "consequat",
      "anim"
    ],
    "friends": [
      {
        "id": 0,
        "name": "Lily Mullen"
      },
      {
        "id": 1,
        "name": "Smith Howard"
      },
      {
        "id": 2,
        "name": "Ronda Stafford"
      }
    ],
    "greeting": "Hello, Crystal Sampson! You have 2 unread messages.",
    "favoriteFruit": "banana"
  }];
  
  const output = input.map(element => {
    return {
      name: element.name,
      gender: element.gender,
      company: element.company,
      email: element.email
    }
  });
  
  console.log(output);

Upvotes: 1

Ankit Agarwal
Ankit Agarwal

Reputation: 30739

You can use a simple for loop for the object in the outer array then for the keys of the object to check if the key exist on the selectedKey array which you want to consider. Using selectedKey will help you to scale easily for any of the keys you want, just specify them in selectedKey array.

var data = [
  {
    "_id": "5a3711070776d02ed87d2100",
    "index": 0,
    "guid": "fb08e9c3-c5b6-44e9-a4c6-73edcfbc8ae9",
    "isActive": false,
    "balance": "$2,762.54",
    "picture": "http://placehold.it/32x32",
    "age": 39,
    "eyeColor": "brown",
    "name": "Crystal Sampson",
    "gender": "female",
    "company": "ZAGGLE",
    "email": "[email protected]",
    "phone": "+1 (822) 582-2186",
    "address": "836 Batchelder Street, Harviell, Indiana, 966",
    "about": "Duis eu irure mollit sit voluptate proident do reprehenderit irure sunt irure tempor. Elit commodo mollit Lorem esse elit ea nostrud. Commodo cillum ipsum enim incididunt aliquip consectetur cillum cillum commodo et aliquip.\r\n",
    "registered": "2017-01-31T09:56:39 -07:00",
    "latitude": 18.386331,
    "longitude": -3.807078,
    "tags": [
      "laboris",
      "reprehenderit",
      "aliqua",
      "ipsum",
      "in",
      "consequat",
      "anim"
    ],
    "friends": [
      {
        "id": 0,
        "name": "Lily Mullen"
      },
      {
        "id": 1,
        "name": "Smith Howard"
      },
      {
        "id": 2,
        "name": "Ronda Stafford"
      }
    ],
    "greeting": "Hello, Crystal Sampson! You have 2 unread messages.",
    "favoriteFruit": "banana"
  }];
  
var selectedKey = ['name','company','gender', 'email'];

var res = [];
data.forEach((obj)=>{
  Object.keys(obj).forEach((key)=>{
    if(selectedKey.indexOf(key) !== -1){
      var tempObj = {};
      tempObj[key] = obj[key]
      res.push(tempObj);
    }
  });
});

console.log(res);

Upvotes: 0

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