feat: let cluster accept any iterable

src/array/cluster.ts

@@ -1,3 +1,5 @@
+import { toIterable, type ToIterableItem } from 'radashi'
+
 /**
  * Splits a single list into many lists of the desired size.
  *
@@ -6,10 +8,17 @@
  * // [[1, 2], [3, 4], [5, 6]]
  * ```
  */
-export function cluster<T>(array: readonly T[], size = 2): T[][] {
-  const clusters: T[][] = []
-  for (let i = 0; i < array.length; i += size) {
-    clusters.push(array.slice(i, i + size))
+export function cluster<T extends object>(
+  array: T,
+  size = 2,
+): ToIterableItem<T>[][] {
+  const clusters: any[][] = []
+  let cluster = (clusters[0] = [] as any[])
+  for (const item of toIterable(array)) {
+    if (cluster.length === size) {
+      clusters.push((cluster = []))
+    }
+    cluster.push(item)
   }
   return clusters
 }