def test_functor_1st_low(self):
seq = Seq(1, 2, 3, 4, 5)
def identity(x):
return x
self.assertEqual(seq.map(identity), identity(seq))
def test_monad_1st_low(self):
seq = Seq(1)
def f(x):
return Seq(x + 1)
self.assertEqual(seq.flat_map(f), f(1))
def test_applicative_2nd_low(self):
seq = Seq(1, 2, 3, 4, 5)
def identity(x):
return x
self.assertEqual(seq.ap(Seq(identity)), seq)
def test_applicative_1st_low(self):
seq = Seq(1, 2, 3, 4, 5)
def f(x):
return x + 1
self.assertEqual(seq.ap(Seq(f)), seq.map(f))
def test_functor_2nd_low(self):
seq = Seq(1, 2, 3, 4, 5)
def f(x):
return x + 1
def g(x):
return x * 2
self.assertEqual(seq.map(lambda x: f(g(x))), seq.map(g).map(f))
def test_monad_3rd_low(self):
seq = Seq(1, 2, 3, 4, 5)
def f(x):
return Seq(x + 1)
def g(x):
return Seq(x * 2)
self.assertEqual(
seq.flat_map(f).flat_map(g), seq.flat_map(lambda x: f(x).flat_map(g)))
def f(x):
return Seq(x + 1)
def g(x):
return Seq(x * 2)
def test_monad_2nd_low(self):
seq = Seq(1, 2, 3, 4, 5)
self.assertEqual(seq.flat_map(Seq), seq)
def test_fold(self):
seq = Seq(1, 2, 3, 4, 5)
expect = 15
actual = seq.fold(lambda x, y: x + y, 0)
self.assertEqual(expect, actual)