const STR = "insertionsort";
const SORT_STR = "eiinnoorrsstt";
const NUMB = [12, -2, 55, 68, 80];
const SORT_NUMB = [-2, 12, 55, 68, 80];

function swapCharsInString(str: string, i: number, j: number) {
  return (
    str.substring(0, i) +
    str[j] +
    str.substring(i + 1, j) +
    str[i] +
    str.substring(j + 1)
  );
}

const swapElements = (arr: number[], index1: number, index2: number) => {
  [arr[index1], arr[index2]] = [arr[index2], arr[index1]];
};

export function insertionSort(str: string): string;
export function insertionSort(arr: number[]): number[];

export function insertionSort(sortItems: string | number[]) {
  let L: number, R: number;

  for (L = 1; L < sortItems.length; L++) {
    R = L;

    while (R > 0 && sortItems[R] < sortItems[R - 1]) {
      const index1 = R;
      const index2 = R - 1;

      if (typeof sortItems === "string") {
        sortItems = swapCharsInString(sortItems, index2, index1);
      }

      if (Array.isArray(sortItems)) {
        swapElements(sortItems, index1, index2);
      }

      R = R - 1;
    }
  }

  return sortItems;
}

console.log(insertionSort(STR), SORT_STR);
console.log(insertionSort(NUMB), SORT_NUMB);