How to Retrieve the Correct Array Item for Dynamic URL Handling Based on the Last Item's Value?

Determining the Last Item in an Array for Dynamic URL Handling

In this example, our JavaScript code aims to retrieve the last item of an array derived from a URL. The current code captures the second-to-last item, whereas our requirement is to retrieve the third-to-last item if the last item is "index.html." To achieve this, we need to address this condition.

To check for the last item in the array, we can employ an if-else statement:

if (loc_array[loc_array.length - 1] === 'index.html') {
  // Retrieve the third-to-last item
  linkElement.appendChild(newT);
} else {
  // Retrieve the second-to-last item as originally intended
  linkElement.appendChild(newT);
}

By comparing the last item of the array (loc_array[loc_array.length - 1]) with the condition "index.html," we can determine which item to retrieve. If the condition matches, we act accordingly.

Additional Considerations and Enhancements

To handle potential variations in the casing of the file extension, you can use the .toLowerCase() method to ensure case independence.

For improved code quality and efficiency, consider implementing this logic on the server-side rather than the client-side. This approach offers greater flexibility and reliability.

ES-2022 Array.at()

With the introduction of ES-2022, the Array.at() method provides a more concise way to retrieve array elements from either end by specifying a negative index:

if (loc_array.at(-1) === 'index.html') {
  // do something
} else {
  // something else
}

This syntax simplifies the code and enhances readability for ES-2022 compatible environments.

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