3. Types and classes Flashcards
1
Q
How are chars and string stored?
A
char: ‘a’
string: “ask”
2
Q
What is a curried function and give an example of one.
A
A function that uses the fact that we can return functions.
mult :: Int -> (Int -> (Int -> Int))
mult x y z = x * y * z
3
Q
What are polymorphic types?
A
A type that can be many types.
i.e. [a] or b
4
Q
What are class constraints and what is the syntax?
A
specifies the type.
C a where C is the name of the constraint and a is a type of variable.
i.e. (+) :: Num a => a -> a -> a
5
Q
How to check inequality?
A
(/=) :: a -> a -> Bool
6
Q
How to get the negative of a number?
A
negate :: a -> a
7
Q
How do we get the sign of a number?
A
signum :: a -> a
8
Q
How to divide two numbers?
A
> 7 div 2
3
9
Q
How to get the modulo of a fraction?
A
> 7 mod 2
1
