JavaScript – Sort a String Array based on String Length

To sort strings in an array based on length in JavaScript, call sort() method on this string array and pass a comparison function to sort() method, such that the comparison happens for the length of elements.

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arr.sort((a, b) => a.length - b.length)

Example

In the following example, we have taken a string array in arr. We sort this array using sort() method and store the resulting array in sortedArr. We pass a comparison function to sort() method, where it takes two elements (a, b) as arguments, and returns the difference of their lengths.

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<html lang="en">
<head>
    <meta charset="utf-8">
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<body>
    <pre id="output"></pre>
    <script>
        var arr = ['raspberry', 'nut', 'cherry', 'apple'];
        displayOutput = 'Input Array : ' + arr + '\n';

        var sortedArr = arr.sort((a, b) => a.length - b.length);
        displayOutput += 'Sorted Array : ' + sortedArr + '\n';

        document.getElementById("output").innerHTML = displayOutput;
    </script>
</body>
</html>

Conclusion

In this JavaScript Tutorial, we learned how to sort an array of strings based on length using sort() method.