Top "Typeclass" questions

How does deriving work in Haskell?

Algebraic Data Types (ADTs) in Haskell can automatically become instances of some typeclasses (like Show, Eq) by deriving from them. …

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Haskell types frustrating a simple 'average' function

I'm playing around with beginner Haskell, and I wanted to write an average function. It seemed like the simplest thing …

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Haskell: Deriving Show for custom type

I have this type definition: data Operace = Op (Int->Int->Int) String (Int->Int->Int) deriving …

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Functions with generic parameter types

I am trying to figure out how to define a function that works on multiple types of parameters (e.g. …

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What's the difference between type and data type in Haskell?

I'm a little confused as to the difference between a type and a data type in Haskell. From the literature …

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What is the Comonad typeclass in Haskell?

What is the Comonad typeclass in Haskell? As in Comonad from Control.Comonad in the comonad package (explanations of any …

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Java's Interface and Haskell's type class: differences and similarities?

While I am learning Haskell, I noticed its type class, which is supposed to be a great invention that originated …

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Using Eithers with Scala "for" syntax

As I understand it, Scala "for" syntax is extremely similar to Haskell's monadic "do" syntax. In Scala, "for" syntax is …

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Scala double definition (2 methods have the same type erasure)

I wrote this in scala and it won't compile: class TestDoubleDef{ def foo(p:List[String]) = {} def foo(p:List[…

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null instead of ==

I have just started to learn Haskell out of interest. I follow learnyouahaskell.com. There I found this: null checks …

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