How to retrieve specific javascript object including key

Question

javascript object skeleton

var users = {};

users = {
  '123': {
    name: 'Lucky',
    gender: 'female'
  },

  '456': {
    name: 'K',
    gender: 'male'
  }
}

Requirement: i want to retrieve 123 and it's objects by search key (ex: 123)

'123':  
 { name: 'Lucky',  
     gender: 'female' }

similarly if key is 456, i want to retrieve

'456':  
   { name: 'K',  
     gender: 'male' }  
 }

So, what have you tried so far to achieve this as your requirement is quite simple. — Krishna Prashatt, Jul 01 '19 at 08:01
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Property_accessors — 04FS, Jul 01 '19 at 08:02

score 0 · Answer 1 · answered Jul 01 '19 at 08:03

Simply check if the property exists, and return it if it does:

var users = {};

users = {
  '123': {
    name: 'Lucky',
    gender: 'female'
  },

  '456': {
    name: 'K',
    gender: 'male'
  }
};

const search = s => s && users[s] && {[s]: users[s]}

console.log(search('123'))

Jack Bashford · Answer 2 · 2019-07-01T08:07:17.927

0

Really simple - use array notation:

const users = {
  '123': {
    name: 'Lucky',
    gender: 'female'
  },

  '456': {
    name: 'K',
    gender: 'male'
  }
}

const getObjectByNum = n => ({ [n]: users[n] }) || "Not found";

console.log(getObjectByNum(123));
console.log(getObjectByNum(456));

.as-console-wrapper { max-height: 100% !important; top: auto; }

edited Jul 01 '19 at 08:07

answered Jul 01 '19 at 08:04

Jack Bashford

43,180
11
50
79

I think OP wants the key returned too. – Kobe Jul 01 '19 at 08:06
1

Just saw that @Kobe - fixed now. – Jack Bashford Jul 01 '19 at 08:07

connexo · Accepted Answer · 2019-07-01T08:06:50.617

0

You mean dynamic property access? Use [] notation for that.

Inn Javascript, to access an object's property 'xyz' , there's two notations:

obj.xyz

and

ob['xyz']

var users = {
  '123': {
    name: 'Lucky',
    gender: 'female'
  },

  '456': {
    name: 'K',
    gender: 'male'
  }
}

function getUserById(usermap, id) {
  try {
    return { [id]: usermap[id] }
  } catch (error) {
    console.log(error);
  }
}

console.log(getUserById(users, '456'));

edited Jul 01 '19 at 08:06

answered Jul 01 '19 at 08:05

connexo

53,704
14
91
128

I think OP wants to return the key too. – Kobe Jul 01 '19 at 08:06
Adjusted the answer accordingly. – connexo Jul 01 '19 at 08:08

How to retrieve specific javascript object including key

3 Answers3