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15
votes
3answers
2k views

What problem do algebraic data types solve?

Fair warning, I'm new to functional programming so I may hold many bad assumptions. I've been learning about algebraic types. Many functional languages seem to have them, and they are fairly useful ...
5
votes
2answers
174 views

How to design for good abstractions using algebraic data type?

Every now and then I have peaked at Haskell Tutorials and found the Algebraic data types quite interesting. I took their purpose to be to represent types that have completely separable states. Sadly, ...
1
vote
1answer
80 views

ADT design choices

How do you go about deciding which of the following two representations (in F# syntax) is the right choice in a particular situation? type Choice = A of string | B of string Or: type ChoiceKind = ...
3
votes
3answers
288 views

What do I use for a variant in a UML class diagram?

Does standard UML specify how a variant (aka tagged union, discriminated union, sum type, etc) should be depicted in a class diagram?
7
votes
1answer
157 views

I'm being warned that the Monoid I'm creating is an Orphan Instance. Is there a better way to write this functionality in?

type PromptSegment = IO (Maybe String) instance Monoid a => Monoid (IO a) where mempty = return mempty mappend = liftA2 (<>) This behaves exactly how I want for my purposes. For ...
0
votes
3answers
289 views

What procedural languages support algebraic data types? [closed]

One of the things I like about the new Apple language Swift is that it combines procedural programming with algebraic data types. What other languages do this?
25
votes
1answer
672 views

Performance of single-assignment ADT oriented code on modern CPUs

Working in immutable data with single assignments has the obvious effect of requiring more memory, one would presume, because you're constantly creating new values (though compilers under the covers ...
6
votes
2answers
2k views

Matrix Pattern Recognition Algorithm

I am designing a logic analyzer and I would like to implement some Matrix Algorithm. I have several channels each one represented by a row in the matrix and every element in the column would be the ...
32
votes
6answers
4k views

How do you encode Algebraic Data Types in a C#- or Java-like language?

There are some problems which are easily solved by Algebraic Data Types, for example a List type can be very succinctly expressed as: data ConsList a = Empty | ConsCell a (ConsList a) consmap f ...