Custom date range selection.

lib/array.js

@@ -0,0 +1,11 @@
+export function chunk(arr, size) {
+  const chunks = [];
+
+  let index = 0;
+  while (index < arr.length) {
+    chunks.push(arr.slice(index, size + index));
+    index += size;
+  }
+
+  return chunks;
+}