check if data is already present in array of objects

Question

I have the following data with me.

var Inputdata = {};
Inputdata.firstName = 'Raul'
Inputdata.lastName = 'Peters'

I want to check if the firstName and lastName (together) is already present in the array of objects. Can someone please let me know how to achieve this.

UserData: [0] 
      firstName: 'Raul'
      lastName: 'Peters'
      Id: '4'
      [1]
      firstName: 'Amil'
      lastName: 'Rikia'
      Id: '5'
      [2]
      firstName: 'Riya'
      lastName: 'Pillai'
      Id: '6'
      [3]
      firstName: 'Natasha'
      lastName: 'Shacke'
      Id: '6'
      [4]
      firstName: 'Eric'
      lastName: 'Coles'
      Id: '6'

As you can see, Raul Peters is present in the array of objects in one array. I want the output to be true in this case. If Raul and Peters were in different objects, the answer should be false as Raul and Peters are not in the same object. Can anyone please let me know how to achieve this

Using a loop and checking their properties

Suresh Atta
– Suresh Atta

2017-06-27 16:24:59 +00:00
Commented Jun 27, 2017 at 16:24 — Suresh Atta
– Suresh Atta, Commented Jun 27, 2017 at 16:24
Array.prototype.some

royhowie
– royhowie

2017-06-27 16:25:32 +00:00
Commented Jun 27, 2017 at 16:25 — royhowie
– royhowie, Commented Jun 27, 2017 at 16:25
Use Array#find.

user663031
– user663031

2017-06-27 16:29:13 +00:00
Commented Jun 27, 2017 at 16:29 — user663031
– user663031, Commented Jun 27, 2017 at 16:29

tymeJV · Accepted Answer · 2017-06-27 16:25:28Z

2

Just do an Array.some check:

let isPresent = UserData.some(user => user.firstName == 'Raul' && user.lastName == 'Peters')

answered Jun 27, 2017 at 16:25

tymeJV

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Comments

nullqube · Accepted Answer · 2017-06-27 17:04:26Z

0

Use Array.find

arr.find( function(e){
   if(e.firstname == 'Raul' && e.lastname == 'Peters')
     return e;
});

edited Jun 27, 2017 at 17:04

answered Jun 27, 2017 at 16:42

nullqube

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Comments

elqueso101 · Accepted Answer · 2017-06-27 17:08:28Z

const inputData = {};

inputData.firstName = 'Raul';
inputData.lastName = 'Peters';

const userData = [
  {
    firstName: 'Raul',
    lastName: 'Peters',
    Id: '4'
  },
  {
    firstName: 'Amil',
    lastName: 'Rikia',
    Id: '5'
  },
  {
    firstName: 'Riya',
    lastName: 'Pillai',
    Id: '6'
  },
  {
    firstName: 'Natasha',
    lastName: 'Shacke',
    Id: '6'
  },
  {
    firstName: 'Eric',
    lastName: 'Coles',
    Id: '6'
  }
];

This function receives 2 arguments: the userData array of objects and the inputData object. Then, it uses the Array.prototype.some() method to see if there is at least one entry within the userData array that is an object matching the inputData object.

function alreadyExists(userData, inputData) {
  return userData.some(entry => entry['firstName'] === inputData['firstName'] && entry['lastName'] === inputData['lastName']);
};

console.log(alreadyExists(userData, inputData));

drch · Accepted Answer · 2017-06-27 17:11:56Z

0

If you wanna use underscore or lodash you can use function _.some. Using internal variable you can get needle element.

var needle = false;
var has = _.some(UserData, function(v) {
    return (v.firstName===Inputdata.firstName && v.lastName===Inputdata.lastName) ? needle = v : false;
});
console.log(has)
console.log(needle)

answered Jun 27, 2017 at 17:11

drch

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