From f91dda0d7da532925db761791046826368e80bc7 Mon Sep 17 00:00:00 2001
From: Hans Oksendahl <hansoksendahl@gmail.com>
Date: Sun, 23 Jun 2024 16:27:42 -0700
Subject: [PATCH] added swap tuple type

---
 src/tuple/index.ts     |  1 +
 src/tuple/swap.spec.ts |  0
 src/tuple/swap.ts      | 23 +++++++++++++++++++++++
 3 files changed, 24 insertions(+)
 create mode 100644 src/tuple/swap.spec.ts
 create mode 100644 src/tuple/swap.ts

diff --git a/src/tuple/index.ts b/src/tuple/index.ts
index 03cc5ce1..7d49191e 100644
--- a/src/tuple/index.ts
+++ b/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'
diff --git a/src/tuple/swap.spec.ts b/src/tuple/swap.spec.ts
new file mode 100644
index 00000000..e69de29b
diff --git a/src/tuple/swap.ts b/src/tuple/swap.ts
new file mode 100644
index 00000000..bf4aacd9
--- /dev/null
+++ b/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>]]>