How to Sort JavaScript Objects by Property Names: ES5 vs. ES6 Approaches

Organizing JavaScript Objects by Property Names

Sorting JavaScript objects alphabetically by property names is a common requirement, but it poses a challenge as the object keys order is not guaranteed. This article addresses this issue and provides a solution for organizing objects in a specific order.

Outdated ES5 Solution:

As the ES5 specification does not define an order for object keys, the following method can be used, but is not considered future-proof:

<code class="javascript">function sortObject(o) {
    var sorted = {},
    key, a = [];

    for (key in o) {
        if (o.hasOwnProperty(key)) {
            a.push(key);
        }
    }

    a.sort();

    for (key = 0; key < a.length; key++) {
        sorted[a[key]] = o[a[key]];
    }
    return sorted;
}

This solution iterates over the object's keys, sorts them in alphabetical order, and then creates a new object with the sorted keys and their corresponding values.

ES6 Compliant Solution:

With the introduction of ES6, object keys are now guaranteed to be in the order they were defined. Therefore, sorting can be achieved more concisely:

<code class="javascript">const sortedObject = Object.fromEntries(
  Object.entries(originalObject).sort((a, b) => a[0].localeCompare(b[0]))
);</code>

This method converts the object to an array of key-value pairs, sorts the array based on the keys, and then converts the sorted array back into an object using Object.fromEntries().

Conclusion:

While the order of object keys in ES5 is undefined, the provided solutions can be used to sort objects by property names. In ES6 and later, the object keys order is guaranteed, making the sorting process more straightforward.

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