Pass certain parameters from an array of objects

Question

I have an array of objects. if i do a console.log, i can see these array of objects.

[Object, Object, Object, Object,Object]
[0-4]
0:Object
    Name: Nikhil
    User_ID:123 
    admin:true
    read:false
    write:false
1:Object
    Name:andy
    User_ID:124
    admin:false
    read:true
    write:false
2:Object
    Name:Nik
    User_ID:125
    admin:false
    read:false
    write:true
3:Object
    Name:ranea
    User_ID:126
    admin:false
    read:false
    write:true 
4:Object
    Name:isha
    User_ID:127
    admin:false
    read:true
    write:false

Now, if i do JSON.stringify, i get this output.

[{"Name":"Nikhil","User_ID":"123","admin":true,"read":false,"write":false},
{"Name":"andy","User_ID":"124","admin":false,"read":true,"write":false},
{"Name":"Nik","User_ID":"125","admin":false,"read":false,"write":true},         
{"Name":"ranea","User_ID":"126","admin":false,"read":false,"write":true},
{"Name":"isha","User_ID":"127","admin":false,"read":true,"write":false}]

Instead of doing stringify to all the parameters, I want to only do it to few. For e.g. I don't want to pass Name. I only want to pass User_ID since it is unique, and admin,read,write properties.

How can i create a new array of objects using loadash and then stringify the result. My final output after JSON.stringify should be like this

[{"User_ID":"123","admin":true,"read":false,"write":false},
{"User_ID":"124","admin":false,"read":true,"write":false},
{"User_ID":"125","admin":false,"read":false,"write":true},         
{"User_ID":"126","admin":false,"read":false,"write":true},
{"User_ID":"127","admin":false,"read":true,"write":false}]

vorillaz · Accepted Answer · 2016-03-29 21:04:33Z

3

Using _.pick it should be:

 var newArr = _.map(oldArray,
  function(item) {
    return _.pick(item, ['User_ID', 'admin', 'read', 'write']);
  });

answered Mar 29, 2016 at 21:04

vorillaz

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2 Comments

anjali gupte Over a year ago

Hi @theodore- i am getting undefined for all the values. can you have a look at my console output which is mentioned at the start of question.

vorillaz Over a year ago

Hello @anjaligupte checkout my edited answer. I had forgotten the return statement.

christophetd · Accepted Answer · 2016-03-29 21:05:21Z

2

You could make use of the Array.map() function.

var obj = [ { "Name": "Christophe", "Age": 42, "foo": "bar" }, { "Name": "Blah", "Age": 42, "foo": "foo2" }]
var filtered = obj.map(function (element) {
    return {
        "Name": element.Name
    }
});

After that, filtered contains your objects with only the keys you want to keep, and you can JSON.stringify it.

console.log(JSON.stringify(filtered));
// [ {"Name": "Christophe"}, {"Name": "Blah"} ]

answered Mar 29, 2016 at 21:05

christophetd

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Comments

John · Accepted Answer · 2016-03-29 21:46:13Z

0

You can use this little function to return the new Array.

var arr = [{
  Name: "Nikhil",
  User_ID: "123",
  admin: "true",
  read: "false",
  write: "false"
}, {
  Name: "andy",
  User_ID: "124",
  admin: "false",
  read: "true",
  write: "false"
}];

function returnArr(array) {
  var arrNew = arr;
  for (let in arrNew) {
    delete arrNew[let].Name;
  }
  return JSON.stringify(arrNew);
}

document.write(returnArr(arr)); // or console.log(returnArr(arr))

answered Mar 29, 2016 at 21:46

John

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