Learn HASKELL with Real Code Examples

Updated Nov 18, 2025

Introduction & Fundamentals Setup & Configuration Architecture & Deep Internals Performance & Security Development Workflow Learning & Career Growth Business & Strategy Examples

Installation Setup

Install GHC (Glasgow Haskell Compiler)

Install Stack or Cabal

Setup PATH

Install HLS (Haskell Language Server)

Use GHCup for environment management

Environment Setup

Install GHCup

Install GHC + Cabal + Stack

Install HLS

Configure IDE

Config Files

package.yaml

cabal file

stack.yaml

Dockerfile

Cli Commands

stack build

stack run

cabal build

ghci

stack test

Internationalization

Unicode source support

Text-based localization

Accessibility

Clean mathematical syntax

Readable functional expressions

Type inference reduces boilerplate

Ui Styling

Functional GUI via Reflex FRP

Terminal UI via Brick

Web UI via GHCJS or Miso

State Management

No mutable state

State via State monad

IORef/MVar for controlled mutation

STM for transactional memory

Data Management

Algebraic data types

Records

Vectors and Text

Custom types