modelling data

Question 1

homogenious

Answer 1

same data type

Question 2

heterogenious

Answer 2

different data types

Question 3

type keyword

Answer 3

allows you to create a type alias

Question 4

what is an advantage of creating a type alias

Answer 4

means you dont have to write out the type multiple times

Question 5

type alias as transparent

Answer 5

can pass values with the same structure instead of the alias
can change the internal values as much as you want

Question 6

newtype keyword

Answer 6

like type but defines a new type rather than an alias

Question 7

what is a positive and negative of the newtype keyword

Answer 7

allows you to maintain data constraints
cant be used interchangeably by the types its made up of

Question 8

why do we use the deriving keyword

Answer 8

when defining new types we want to avoid making the type an instance of the type class we want to use it with (e.g. deriving(show))

Question 9

data keyword

Answer 9

defines a new data type
allows you to do things that have been build into other languages separately

Question 10

data + enumeration

Answer 10

separates the different values with a |

Question 11

enumeration

Answer 11

a list of all possible values a type can have

Question 12

type constructors

Answer 12

allows you to make a value of a new type/datatype
becomes another function and can be used like one anywhere

Question 13

value constructor

Answer 13

a function that produces a value of the type from arguments inputted

Question 14

smart construction

Answer 14

functions that take the necessary data to create a value of a type and returns the value if the constraints are valid

Question 15

how do we stop smart construction from crashing if the constraints arent valid

Answer 15

using maybe or either

Question 16

parametised types

Answer 16

a generic type; uses a type variable e.g. a

Question 17

what is a benefit of parametised types

Answer 17

allows us to write flexible and reusable data types