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add filter implementation
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2 changed files with 65 additions and 0 deletions
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@ -121,3 +121,30 @@ class ActiveListTest(TestCase):
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transformedList = list.map(lambda x: "prefix-{}".format(x))
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del list[0]
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self.assertEqual(transformedList[0], "prefix-value2")
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def testFilter(self):
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list = ActiveList([1, 2, 3, 4, 5])
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filteredList = list.filter(lambda x: x < 3)
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self.assertEqual(len(filteredList), 2)
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self.assertEqual(filteredList[0], 1)
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self.assertEqual(filteredList[1], 2)
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def testActiveFilterAppend(self):
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list = ActiveList([1, 2, 3, 4, 5])
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filteredList = list.filter(lambda x: x < 3)
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list.append(0)
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self.assertEqual(len(filteredList), 3)
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self.assertEqual(filteredList[2], 0)
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def testActiveFilterUpdate(self):
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list = ActiveList([1, 2, 3, 4, 5])
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filteredList = list.filter(lambda x: x < 3)
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list[3] = 0
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self.assertEqual(len(filteredList), 3)
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self.assertEqual(filteredList[2], 0)
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def testActiveFilterDelete(self):
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list = ActiveList([1, 2, 3, 4, 5])
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filteredList = list.filter(lambda x: x < 3)
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del list[1]
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self.assertEqual(len(filteredList), 1)
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