enhance(client): RSSティッカーで表示順序をシャッフルできるように

packages/client/src/scripts/shuffle.ts

@@ -0,0 +1,19 @@
+/**
+ * 配列をシャッフル (破壊的)
+ */
+export function shuffle<T extends any[]>(array: T): T {
+	let currentIndex = array.length, randomIndex;
+
+	// 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;
+}