Pattern match where type has constructors

I’m using a 3rd party library which has the following types:

Pattern match where type has constructors

I’m using a 3rd party library which has the following types:

When is it a good time to reason about performance in Haskell?

Simon Peyton Jones himself recognizes that reasoning about performance in Haskell is hard due to the non strict semantics.

In-memory datastore in Haskell

I want to implement an in-memory datastore for a web service in Haskell. I want to run transactions in the STM monad.

In-memory datastore in Haskell

I want to implement an in-memory datastore for a web service in Haskell. I want to run transactions in the STM monad.

In-memory datastore in Haskell

I want to implement an in-memory datastore for a web service in Haskell. I want to run transactions in the STM monad.

In-memory datastore in Haskell

I want to implement an in-memory datastore for a web service in Haskell. I want to run transactions in the STM monad.

In-memory datastore in Haskell

I want to implement an in-memory datastore for a web service in Haskell. I want to run transactions in the STM monad.

Why isn’t `length` generic by default?

Haskell often provides two versions of a given function f, i.e:

Why isn’t `length` generic by default?

Haskell often provides two versions of a given function f, i.e: