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By Mena A.S.

ISBN-10: 1430262508

ISBN-13: 9781430262503

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Are you able to do so? Sometimes you need to match on lists of more than one element. A possible function where you would need these is one that checks whether a list of integers is sorted or not. To check for sorted data, three cases need to be considered. The first two are the empty or singleton cases, and those are always sorted. But if more than one element is contained in a list, you need to compare the first with the second, and then see whether the list comprised of the second and subsequent elements is sorted.

To fix this problem, you can use a facility in Haskell called default deriving that allows adding some functionality to an ADT without writing any code. In this case, you want to able to get a string representation of the values, so you need to derive Show. Show is a type class: implementing it means that there’s a way to get a string out of any value of this type. You can write the code yourself, or you can allow Haskell to write it for you. DataTypes> Individual "Jack" "Smith" True Individual "Jack" "Smith" True There’s no impediment when using one ADT that you define inside another one.

DataTypes> GovOrgR "NATO" GovOrgR {clientRName = "NATO"} Field names are also used to create special functions that access those particular fields. DataTypes> :t duty duty :: ClientR -> String As these functions will be automatically created, Haskell enforces two extra restrictions on field names: • They must not clash with any other field or function name. • As I mentioned before, you are allowed to use the same field name in more than one of the alternatives of your data type. However, if you do so, all those fields must have the same type.

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Beginning Haskell. a project-based approach by Mena A.S.

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