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feat: empty arr is falsy #214

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feat: empty arr is falsy #214

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MartinBernstorff Apr 10, 2025
5683efd
update arr.py and test_arr.py
MartinBernstorff Apr 10, 2025
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2 changes: 2 additions & 0 deletions iterpy/arr.py
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,8 @@ def __len__(self) -> int:
return len(self._iter)

def __bool__(self) -> bool:
if self.len() == 0:
return False
return self.lazy().__bool__()

def __iter__(self) -> Arr[T]:
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9 changes: 9 additions & 0 deletions iterpy/test_arr.py
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Expand Up @@ -161,6 +161,15 @@ def test_chain():
assert result == [1, 2, 3, 4]


def test_empty_is_falsy():
test_iterator = Arr([]) # type: ignore
assert not test_iterator

test_iterator = Arr([1])
assert test_iterator
assert bool(test_iterator) is True


@pytest.mark.benchmark()
def test_benchmark_large_flattening():
test_input = Arr(range(100_000)).map(lambda x: Arr([x]))
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