def test_compose_mapping_and_filter(self): tdx = compose( tdc.filtering(lambda x: x < 5), tdc.mapping(lambda x: x * 2)) x = tdc.reduce(tdx(operator.mul), range(1, 10), 1) self.assertEqual( x, tdc.reduce(operator.mul, (i * 2 for i in range(1, 10) if i < 5), 1))
def test_compose_three_transducers(self): tdx = compose( tdc.mapping(lambda x: x * 2), tdc.mapping(lambda x: x * x), tdc.filtering(lambda x: x % 2 == 0)) x = tdc.reduce(tdx(operator.add), range(100), 0) self.assertEqual( x, sum(filter(lambda x: x % 2 == 0, (x * x for x in (y * 2 for y in range(100))))))
def test_filtering(self): f = tdc.filtering(lambda x: x < 10) x = tdc.reduce(f(operator.add), range(100), 0) self.assertEqual(x, sum(range(10)))