Comparing objects in two arrays

Question

I want to compare objects in two arrays and if they are not the same, add them to the array.
first array

[
  {
    "email": "[email protected]"
  },
  {
    "email": "[email protected]"
  },
  {
    "email": "[email protected]"
  },
  {
    "email": "[email protected]"
  }
]

secund array

[
  {
    "email": "[email protected]"
  },
  {
    "email": "[email protected]"
  },
  {
    "email": "[email protected]"
  }
]

checking function

if($scope.participants.length > 0){
    result.forEach(function (resultElement) {   
        if(!$scope.participants.includes(resultElement) ) {
            $scope.participants.push(resultElement);
        }
    })
    result = [];
    console.log($scope.participants);
}

I checked the debug and it drops on the if condition.

If one of the email values is identical in both arrays, should the new array contain that email twice? Or should the arrays merge when they are not 100% identical ( and contain duplicate email values )? — Rob Monhemius
– Rob Monhemius, Commented Mar 6, 2020 at 13:38

mosmk · Accepted Answer · 2020-03-06 13:13:09Z

1

You need to understand that two objects are not equal and the same.

For example {} === {} returns false

if you want to compare objects you need to compare each primitive element of each object.

Primitives include numbers, strings, booleans, etc and not objects or arrays (which are also objects).

answered Mar 6, 2020 at 13:13

mosmk

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Comments

georgeawg · Accepted Answer · 2020-03-06 13:59:46Z

0

b1 = [
    { id: 0, email: 'john@' }, 
    { id: 1, email: 'mary@' }, 
    { id: 2, email: 'pablo@' }, 
    { id: 3, email: 'escobar@' } 
  ]; 
  
 b2 = [
    { id: 0, email: 'john@' }, 
    { id: 1, email: 'mary@' }
  ];

   var res = this.b1.filter(item1 => 
  !this.b2.some(item2 => (item2.id === item1.id && item2.name === item1.name)))
  
  console.log("check more is working",res);

edited Mar 6, 2020 at 13:59

georgeawg

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answered Mar 6, 2020 at 13:22

Pushprajsinh Chudasama

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1 Comment

user10997699 Over a year ago

I converted your function like that

var res = $scope.participants.filter(item1 =>                          !result.some(item2 => (item2.email === item1.email)))

but item2 is not defined in the debugger and the result has objects

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