def test_just_functor_law2(self):
# fmap (f . g) x = fmap f (fmap g x)
def f(x):
return x + 10
def g(x):
return x * 10
x = Just(42)
self.assertEquals(x.map(compose(f, g)), x.map(g).map(f))
def test_just_functor_law2(self):
# fmap (f . g) x = fmap f (fmap g x)
def f(x):
return x+10
def g(x):
return x*10
x = Just(42)
self.assertEquals(
x.map(compose(f, g)),
x.map(g).map(f)
)
def test_just_functor_law1(self):
# fmap id = id
x = Just(3)
self.assertEquals(
x.map(identity),
x
)
def test_just_functor_law1(self):
# fmap id = id
x = Just(3)
self.assertEqual(
x.map(identity),
x
)
def test_just_functor_map(self):
f = lambda x: x*2
x = Just(21)
self.assertEquals(
x.map(f),
Just(42)
)
def test_just_functor_map(self):
f = lambda x: x * 2
x = Just(21)
self.assertEqual(
x.map(f),
Just(42)
)
