refactor(frontend): scripts -> utility

packages/frontend/src/utility/shuffle.ts

@@ -0,0 +1,25 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/**
+ * 配列をシャッフル (破壊的)
+ */
+export function shuffle<T extends unknown[]>(array: T): T {
+	let currentIndex = array.length;
+	let randomIndex: number;
+
+	// While there remain elements to shuffle.
+	while (currentIndex !== 0) {
+		// Pick a remaining element.
+		randomIndex = Math.floor(Math.random() * currentIndex);
+		currentIndex--;
+
+		// And swap it with the current element.
+		[array[currentIndex], array[randomIndex]] = [
+			array[randomIndex], array[currentIndex]];
+	}
+
+	return array;
+}