feat: add utils function for array

src/utils/arr.ts

@@ -1,11 +1,15 @@
-export function removeAt<T extends any[]>(arr: T, idx: number) {
+const arr = { move, removeAt, insertAt };
+
+export function move<T extends any>(arr: T[], idx: number, offset: number) {
+  arr.splice(idx + offset, 0, ...arr.splice(idx, 1));
+}
+
+export function removeAt<T extends any>(arr: T[], idx: number) {
   return arr.splice(idx, 1);
 }
 
-export function insertAt<T extends any[]>(
+export function insertAt<T extends any>(arr: T[], idx: number, item: T) {
-  arr: T,
-  idx: number,
-  item: T[number],
-) {
   return arr.splice(idx, 0, item);
 }
+
+export default arr;