Refactor

src/components/util.ts

@@ -0,0 +1,7 @@
+export function window<T>(arr: T[], len: number): T[][] {
+    let result: T[][] = [];
+    for (let i = 0; i < arr.length; i += len) {
+        result.push(arr.slice(i, i + len));
+    }
+    return result;
+}