Ways to retrieve a specific String key from an array of objects in JavaScript

Question

Ways to retrieve a specific String key from an array of objects in JavaScript

Consider the following array:

snacksArray = [{'cookies':'delicious'},{'brownies':'scrumptious'}]

If I were to retrieve snacksArray[0], I would get {'cookies':'delicious'}. Now, let's say I added an object to this array like this:

snacksArray.push({[treat]:yumminess})

However, when attempting to access the keys cookies or brownies in each object within this array, I encounter issues. Trying snacksArray[0].treat results in undefined.

Typically, when assigning a value/variable to a key of an object, they should be encased in square brackets. So how do we go about extracting values from them later on when these objects are part of an array, as illustrated in the example above? I attempted using Object.keys(snacksArray[index]), but this only provides me with the keys themselves rather than allowing me to extract the specific value associated with that particular key.

In summary: How can we extract the value paired with a key within an object that is contained in an array, particularly when the keys are strings akin to the instance below?

snacksArray = [{'cookies':'delicious'},{'brownies':'scrumptious'}]

javascript json object key

Answer 1

Answer №1

If you want to extract only the first element from an array of objects, one approach is to use Object.keys.

var chipsArray = [{ cheetos: 'good' }, { dorritos: 'better' }];

chipsArray.forEach(function (object) {
    var key = Object.keys(object)[0];
    console.log(key, object[key]);
});

Another option is to create a new object with references to the single objects.

var chipsArray = [{ cheetos: 'good' }, { dorritos: 'better' }],
    hash = Object.create(null);

chipsArray.forEach(function (object) {
    hash[Object.keys(object)[0]] = object;
});

console.log(hash['dorritos']['dorritos']);

Answer 2

If you want to extract only the first element from an array of objects, one approach is to use Object.keys.

var chipsArray = [{ cheetos: 'good' }, { dorritos: 'better' }];

chipsArray.forEach(function (object) {
    var key = Object.keys(object)[0];
    console.log(key, object[key]);
});

Another option is to create a new object with references to the single objects.

var chipsArray = [{ cheetos: 'good' }, { dorritos: 'better' }],
    hash = Object.create(null);

chipsArray.forEach(function (object) {
    hash[Object.keys(object)[0]] = object;
});

console.log(hash['dorritos']['dorritos']);

Answer 3

Answer №2

Check out this handy function that retrieves the value based on a specific key within an array

function getItemByKey (key, array) {
    var value;
    array.some(function (obj) {
        if (obj[key]) {
            value = obj[key];
            return true;
        }
        return false;
    });
    return value;
}

Learn more about the Array.prototype.some method here

Answer 4

Check out this handy function that retrieves the value based on a specific key within an array

function getItemByKey (key, array) {
    var value;
    array.some(function (obj) {
        if (obj[key]) {
            value = obj[key];
            return true;
        }
        return false;
    });
    return value;
}

Learn more about the Array.prototype.some method here

Answer 5

Answer №3

The most straightforward method would be to retrieve the value like so:

Object.values(chipsArray[i])

With 'i' representing the index of the array.

Here is the result:

> chipsArray = [{'cheetos':'good'},{'dorritos':'better'}]
[ { cheetos: 'good' }, { dorritos: 'better' } ]
> Object.values(chipsArray[0])
[ 'good' ]

Answer 6

The most straightforward method would be to retrieve the value like so:

Object.values(chipsArray[i])

With 'i' representing the index of the array.

Here is the result:

> chipsArray = [{'cheetos':'good'},{'dorritos':'better'}]
[ { cheetos: 'good' }, { dorritos: 'better' } ]
> Object.values(chipsArray[0])
[ 'good' ]

Ways to retrieve a specific String key from an array of objects in JavaScript

Answer №1

Answer №2

Answer №3

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