chunked list extension

lib/utilities/extensions/impl/list.dart

@@ -0,0 +1,19 @@
+extension ListExt<T> on List<T> {
+  List<List<T>> chunked({required int chunkSize}) {
+    final remainder = length % chunkSize;
+    final count = length ~/ chunkSize;
+    final List<List<T>> result = [];
+
+    int i = 0;
+    while (i < count) {
+      result.add(sublist(i, i + chunkSize));
+      i++;
+    }
+
+    if (remainder > 0) {
+      result.add(sublist(i, i + remainder));
+    }
+
+    return result;
+  }
+}

test/utilities/extensions/list_test.dart

@@ -0,0 +1,33 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:stackwallet/utilities/extensions/extensions.dart';
+
+void main() {
+  test("Empty list", () {
+    final List<int> list = [];
+    expect(
+      list.chunked(chunkSize: 3).isEmpty,
+      true,
+    );
+  });
+
+  test("No remainder", () {
+    final List<int> list = [0, 1, 2, 3, 4, 5, 6, 7, 8];
+    final chunked = list.chunked(chunkSize: 3);
+    expect(chunked.length == 3, true);
+    expect(
+      chunked.map((e) => e.length == 3).reduce((v, e) => v && e),
+      true,
+    );
+  });
+
+  test("Some remainder", () {
+    final List<int> list = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
+    final chunked = list.chunked(chunkSize: 3);
+    expect(chunked.length == 4, true);
+    expect(chunked.last.length == 1, true);
+    expect(
+      chunked.map((e) => e.length == 3).reduce((v, e) => v && e),
+      false,
+    );
+  });
+}