[solution] insertion sort words add

lib/insertionsort.ts

@@ -3,6 +3,9 @@ const SORT_STR = "eiinnoorrsstt";
 const NUMB = [12, -2, 55, 68, 80];
 const SORT_NUMB = [-2, 12, 55, 68, 80];
 
+const WORDS = ["strc", "avgrs", "bds"];
+const SORT_WORDS = ["avgrs", "bds", "strc"];
+
 function swapCharsInString(str: string, i: number, j: number) {
   return (
     str.substring(0, i) +
@@ -13,14 +16,19 @@ function swapCharsInString(str: string, i: number, j: number) {
   );
 }
 
-const swapElements = (arr: number[], index1: number, index2: number) => {
+const swapElements = (
+  arr: number[] | string[],
+  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(arr: string[]): string[];
 
-export function insertionSort(sortItems: string | number[]) {
+export function insertionSort(sortItems: string | number[] | string[]) {
   let L: number, R: number;
 
   for (L = 1; L < sortItems.length; L++) {
@@ -47,3 +55,4 @@ export function insertionSort(sortItems: string | number[]) {
 
 console.log(insertionSort(STR), SORT_STR);
 console.log(insertionSort(NUMB), SORT_NUMB);
+console.log(insertionSort(WORDS), SORT_WORDS);