Flexible Array and String Sort Utility

sortFn.js

function sort(input, ...sortArgs) {
  // Handles both null and undefined
  if (input == null) return [];

  if (typeof input === 'string') {
    return input.split(',').sort(...sortArgs);
  }

  if (Array.isArray(input)) {
    return input.slice().sort(...sortArgs);
  }

  console.error("Input must be a string, array, null, or undefined");
}

// const result1 = sort("Blue,Humpback,Beluga");
// console.log(result1);

// const result2 = sort([42, 7, 18, 92]);
// console.log(result2);

// const result3 = sort([42, 7, 18, 92], (a, b) => b - a);
// console.log(result3);

// const result4 = sort(null);
// console.log(result4);

// const result5 = sort(undefined);
// console.log(result5);

// sort(123);