In Haskell, and and or are two built-in functions that take a list of Boolean values and return a Boolean result.
The and function returns True if all elements of the list are True, and False otherwise. Here's an example:
> and [True, True, False]
False
> and [True, True, True]
True
The or function returns True if at least one element of the list is True, and False otherwise. Here's an example:
> or [True, True, False]
True
> or [False, False, False]
False
You can also use and and or in conjunction with other functions in a more complex expression. For example:
> let list = [1,2,3,4]
> or (map (\x -> x mod 2 == 0) list)
True
This code uses map to check whether each element of list is even (by checking whether its remainder when divided by 2 is 0), and or to check whether at least one of those elements is even.