Jan Vladimir Mostert: <https://en.wikipedia.org/wi...

# announcements

[vaskir]

Jan Vladimir Mostert: https://en.wikipedia.org/wiki/Covariance_and_contravariance_(computer_science)

[janvladimirmostert]

vaskir: interesting! So what does it mean practically? That I can pass in a list of apples when the method expects a list of fruit as long as I mark it as <in Fruit>