How do you evaluate the sorting in the application — does it work correctly?

To evaluate whether sorting in the application works correctly, several aspects need to be checked:

1. Correctness of the result: Ensure that the elements are indeed sorted in the desired order (ascending, descending, by the required field).
2. Stability of sorting: If the order of equal elements is important, make sure it is preserved.
3. Testing with different data: Use boundary cases — an empty list, one element, an already sorted list, a list with duplicates.
4. Performance: For large volumes of data, check that sorting does not slow down the interface.

Example of a check in JavaScript:

const sorted = sortFunction(inputArray);
for (let i = 1; i < sorted.length; i++) {
  if (sorted[i] < sorted[i - 1]) {
    throw new Error('Sorting is incorrect');
  }
}
console.log('Sorting works correctly');

It is also useful to cover sorting with unit tests for different scenarios.