added swap tuple type

src/tuple/index.ts

@@ -9,4 +9,5 @@ export * from './prepend'
 export * from './rest'
 export * from './reverse'
 export * from './slice'
+export * from './swap'
 export * from './tuple'

src/tuple/swap.ts

@@ -0,0 +1,23 @@
+import type { LengthProp } from '~/object/length-prop'
+
+/**
+ * Swaps two elements in an array.
+ *
+ * @typeParam A - The input array.
+ * @typeParam B - The index of the first element to swap.
+ * @typeParam C - The index of the second element to swap.
+ * @typeParam D - The resulting array after swapping the elements.
+ */
+type Swap<
+  A extends any[],
+  B extends number,
+  C extends number,
+  D extends any[] = [],
+> =
+  LengthProp<D> extends LengthProp<A>
+    ? D
+    : LengthProp<D> extends B
+      ? Swap<A, B, C, [...D, A[C]]>
+      : LengthProp<D> extends C
+        ? Swap<A, B, C, [...D, A[B]]>
+        : Swap<A, B, C, [...D, A[LengthProp<D>]]>