Fix mobile post create.

1 files changed, 41 insertions, 0 deletions

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;
+}