From 754597d49cd2d3f6295e5fe3ed68c6210bf4e8a5 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Thu, 14 Sep 2023 18:58:44 +0800
Subject: Fix mobile post create.

---
 FrontEnd/src/utilities/array.ts | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 FrontEnd/src/utilities/array.ts

(limited to 'FrontEnd/src/utilities/array.ts')

diff --git a/FrontEnd/src/utilities/array.ts b/FrontEnd/src/utilities/array.ts
new file mode 100644
index 00000000..838e8744
--- /dev/null
+++ b/FrontEnd/src/utilities/array.ts
@@ -0,0 +1,41 @@
+export function copy_move<T>(
+  array: T[],
+  oldIndex: number,
+  newIndex: number,
+): T[] {
+  if (oldIndex < 0 || oldIndex >= array.length) {
+    throw new Error("Old index out of range.");
+  }
+
+  if (newIndex < 0) {
+    newIndex = 0;
+  }
+
+  if (newIndex >= array.length) {
+    newIndex = array.length - 1;
+  }
+
+  const result = array.slice();
+  const [element] = result.splice(oldIndex, 1);
+  result.splice(newIndex, 0, element);
+
+  return result;
+}
+
+export function copy_insert<T>(array: T[], index: number, element: T): T[] {
+  const result = array.slice();
+  result.splice(index, 0, element);
+  return result;
+}
+
+export function copy_push<T>(array: T[], element: T): T[] {
+  const result = array.slice();
+  result.push(element);
+  return result;
+}
+
+export function copy_delete<T>(array: T[], index: number): T[] {
+  const result = array.slice();
+  result.splice(index, 1);
+  return array;
+}
-- 
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