omni-tools/src/pages/list/reverse/service.ts

type SplitOperatorType = 'symbol' | 'regex';

export function reverseList(
  splitOperatorType: SplitOperatorType,
  splitSeparator: string,
  joinSeparator: string = '\n',
  input: string
): string {
  let array: string[] = [];
  switch (splitOperatorType) {
    case 'symbol':
      array = input.split(splitSeparator);
      break;
    case 'regex':
      array = input
        .split(new RegExp(splitSeparator))
        .filter((item) => item !== '');
      break;
  }

  const reversedList = array.reverse();
  return reversedList.join(joinSeparator);
}