Determine whether a specific property of an object is equal to null or undefined

Question

Determine whether a specific property of an object is equal to null or undefined

I am trying to work with an object structured like this :

    $scope.contact = {
        name: contact.gd$name.gd$givenName.$t,
        familyName: contact.gd$name.gd$familyName.$t,
        phone: contact.gd$phoneNumber[0].$t,
        mail: contact.gd$email[0].address,
        organization: contact.gd$organization[0].gd$orgTitle.$t
    };

Is there a way to efficiently inspect this object to check if any of its properties are null or undefined, and then report which ones they are?

I could use a loop for this task, but I am curious if there is a quicker method available.

javascript angularjs json

Answer 1

Answer №1

Here's a way to do it:

let emptyProps = Object.keys($scope.contact).filter(function(key) {
    return $scope.contact[key] === null || typeof $scope.contact[key] === "undefined";
});

This code snippet loops through all the properties of the object $scope.contact and only selects those with values that are either null or undefined.

Answer 2

Here's a way to do it:

let emptyProps = Object.keys($scope.contact).filter(function(key) {
    return $scope.contact[key] === null || typeof $scope.contact[key] === "undefined";
});

This code snippet loops through all the properties of the object $scope.contact and only selects those with values that are either null or undefined.

Answer 3

Answer №2

If you want to create a function that filters out keys with null or undefined values, you can use the following helper function:

const exampleObj = {
    name: 'John',
    age: 30,
    city: null,
    country: undefined,
    active: false
}

const filterEmptyKeys = obj => Object.keys(obj).filter(key => obj[key] == null)

const result = filterEmptyKeys(exampleObj);

console.log(result);

Answer 4

If you want to create a function that filters out keys with null or undefined values, you can use the following helper function:

const exampleObj = {
    name: 'John',
    age: 30,
    city: null,
    country: undefined,
    active: false
}

const filterEmptyKeys = obj => Object.keys(obj).filter(key => obj[key] == null)

const result = filterEmptyKeys(exampleObj);

console.log(result);

Determine whether a specific property of an object is equal to null or undefined

Answer №1

Answer №2

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