| 348 | self.assertEqual(seq(l_num).accumulate(), expect_num) |
| 349 | |
| 350 | def test_aggregate(self): |
| 351 | f = lambda current, next_element: current + next_element |
| 352 | l = self.seq([1, 2, 3, 4]) |
| 353 | self.assertEqual(l.aggregate(f), 10) |
| 354 | self.assertEqual(l.aggregate(0, f), 10) |
| 355 | self.assertEqual(l.aggregate(0, f, lambda x: 2 * x), 20) |
| 356 | l = self.seq(["a", "b", "c"]) |
| 357 | self.assertEqual(l.aggregate(f), "abc") |
| 358 | self.assertEqual(l.aggregate("", f), "abc") |
| 359 | self.assertEqual(l.aggregate("", f, lambda x: x.upper()), "ABC") |
| 360 | self.assertEqual(l.aggregate(f), "abc") |
| 361 | self.assertEqual(l.aggregate("z", f), "zabc") |
| 362 | self.assertEqual(l.aggregate("z", f, lambda x: x.upper()), "ZABC") |
| 363 | with self.assertRaises(ValueError): |
| 364 | l.aggregate() |
| 365 | with self.assertRaises(ValueError): |
| 366 | l.aggregate(None, None, None, None) |
| 367 | |
| 368 | def test_fold_left(self): |
| 369 | f = lambda current, next_element: current + next_element |