# Blog articles

### From HaskellWiki

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## Revision as of 04:31, 28 June 2007

Many areas of Haskell have been explored in the form of blog posts. This page collects the best of those articles from across the web.

### 1 Introductions to Haskell

- ONLamp: An Introduction to Haskell
- Haskell Study Plan
- On Haskell, Intuition And Expressive Power
- Haskell: Raising the bar
- Learning the Haskell programming language
- On learning Haskell
- My evolution as a Haskell programmer
- Why its hard for imperative programmers to learn Haskell
- Flirting with Functional Programming
- Building a Firewall Against Complexity
- Haskell, bondage-and-discipline and separation-of-concerns programming
- Type systems as safety belts
- Haskell introduction for beginners
- Haskell Basics
- Haskell Preliminaries: Implementations and Tools
- Simple Functions in Haskell
- A Haskell study plan
- Haskell Eye for the Ruby Guy

#### 1.1 First impressions

- Haskell First Impressions
- One month in Haskell
- Thoughts on one week in Haskell
- The beauty of Haskell
- Monad wrangling, and the joy of #haskell
- Learning Haskell
- I like Haskell a lot

### 2 Comparisons to other languages

### 3 Functional programming

- A fold-like procedure in C
- What's wrong with for loops
- More on what's wrong with for loops
- Liberating Myself from the von Neumann Style
- Programming Productivity and Programming Languages
- Haskell - A valuable language
- On Functional Programming
- Functional programming is a silver bullet
- Silver Bullets Incoming!
- Computers were invented to keep track of boring things
- Functional programming for the rest of us
- Zen and the Art of Functional Programming
- Thinking in types

### 4 Programming exercises

- Diff in Haskell
- Introductory Haskell: Solving the Sorting-It-Out Kata
- A Simple RPN Calculator in Haskell
- Eratosthenes sieve
- Software Cipher
- Secret Santas in Haskell I: Preliminaries
- Secret Santas in Haskell II: Orbits and Lists
- Secret Santas in Haskell III: Lather, Rinse, Repeat 1
- The Dot-Matrix Printhead: a Haskell Toy
- The Revised Dot-Matrix Printhead
- Run length encoding:
- Overlap function in Haskell for rectangles
- Tying Knots Generically
- A quick and dirty theorem prover in Haskell
- Brainf*k interpreter in Haskell
- FourFours in Haskell
- Using Bayesian filtering instead of 'if' in Haskell
- Prime sieves in Haskell
- Bowling in Haskell
- Norvig's spell checker and idiomatic Haskell

#### 4.1 Games

### 5 Laziness

### 6 Records

### 7 IO

- Haskell I/O for imperative programmers
- Directory tree printing:
- Introductory console IO in Haskell
- Listing files in Haskell
- Playing unsafe Haskell
- separating IO from logic -- example
- Programming Haskell
- Design Patterns in Haskell: bracket
- 7 Rules for IO in Haskell
- File related hacking

#### 7.1 Command line arguments

#### 7.2 Unix

- Simple Unix Tools in Elegant Haskell
- HSH: a Haskell scripting environment
- Function composition and unix pipes
- Practical Haskell: shell scripting with error handling and privilege separation
- A simple file filter
- Signal handling

### 8 Network

#### 8.1 HTTP

#### 8.2 TCP

- Simple STM TCP server
- Haskell's 'interact' with TCP sockets
- Port Scanner in Haskell
- Simple socket programming:
- On haskell: writing a packet sniffer
- A simple echo server

#### 8.3 IRC

### 9 Parallelism and Concurrency

- Threads Considered Harmful (discusses The Problem with Threads)
- STM and IO
- Synchronised threads:
- More Haskell parallelism

### 10 Performance

### 11 Parsing

- Parser combinators
- Monadic parsing
- Adventures in Haskell: the Parsec magic weapon
- Adventures in Haskell: parsing the game world
- Combinator parsing
- Parser with Writer monad
- Simple Parsec Example: HTMangL
- Parsers, Parsec and Haskell
- Interesting parsers in Haskell
- Explicit Typing, Trail Blazing, and Packrat Parsing
- Playing fast and loose with Parsec for parsing in Haskell
- Config file parsing
- Parsing JSON in Haskell
- Write yourself a Scheme in 48 hours
- A beginner with Parsec

### 12 Code generation

- Writing x86 code generators with Harpy:

### 13 Monads

- The monad laws
- The Trivial Monad
- Tracking tainted data: Homeland Security Threat Level Monad
- Monads: a field guide
- Variable substitution gives a ... monad
- The monad behind every zipper
- Monads for vector spaces, probability and quantum mechanics pt. I
- Monads, Vector Spaces and Quantum Mechanics pt. II
- How to write tolerably efficient optimzation code without really trying...
- Quick interpreters with the Reader monad
- Monads
- More on Haskell, Side Effects and Code Reuse
- A First Step Into Monads
- More Monads: Stateful Programming
- The theory of monads
- A newbie in Haskell land or another monad tutorial
- A newbie in Haskell land : The (->) monad
- Smart classification using Bayesian monads
- 3 open problems with monads
- Monads in 15 minutes: Backtracking and Maybe
- How to make Data.Set a monad
- Monads work because they have a tight interface
- Haskell: bootstrapping into a clue about monads
- Why monads matter
- Monads through Pictures
- Monads as universe helpers
- Simple state monad
- repeat and sequence
- What's a monad?

#### 13.1 Monad transformers

- A twisted history of monad transformers
- How To Use Monad Transformers
- Local and global side effects with monad transformers
- Grok monad transformers
- A Simple Game with StateT

#### 13.2 Arrows

#### 13.3 Comonads

- Comonads and reading from the future
- Evaluating cellular automata is co-monadic
- Understanding comonads

### 14 Error handling and exceptions

- Error handling in Haskell
- Some Very Basic Haskell and Thoughts on Error Diagnosis
- 8 ways to report errors in Haskell
- Towards Better Error Handling

### 15 Types

- A type-based solution to the 'strings problem'
- Generalised Algebraic Data Types, Phantom Types, and Dependent Types
- Functions, Types, Function Types, and Type Inference
- Building Datatypes in Haskell (part 1)
- Rank-2 polymorphism is a strange thing
- Scientific.Dimension: Type Arithmetic and Physical Units in Haskell

#### 15.1 Type classes

### 16 Data structures

- Queues without pointers
- A Tree Grows Up in Haskell: Building a Dictionary Type
- Haskell Stacks : Two Different Ways
- A counter datatype with constant-time update
- Map fusion: Making Haskell 225% faster
- Roll Your Own Window Manager: Tracking Focus with a Zipper

#### 16.1 Strings

### 17 Algorithms and techniques

#### 17.1 Folds

#### 17.2 Dynamic programming

#### 17.3 Mutable data

#### 17.4 Sections and Currying

### 18 GUIs

### 19 Databases

### 20 Graphics

### 21 Web and XML

- Haskell and Web Applications
- Ruby and Haskell: write your Rails backend code in Haskell instead of C
- Writing a Simple Search Engine in Haskell
- Haskell and the web: some ideas in progress
- A search engine (core) written in Haskell
- Haskell Transactional Cache

#### 21.1 HTML

#### 21.2 XML, Atom, RSS

- Really simple Atom syndication
- A simple RSS aggregator in 50 lines of Haskell using HXT
- Using the Haskell XML Toolbox

### 22 Maths

#### 22.1 Haskell for mathematics

- Learn Maths with Haskell
- Practical Synthetic Differential Geometry
- More Low Cost Geometric Algebra
- Algebraic Topology in Haskell
- Infinitesimal Types
- Geometric Algebra for Free!
- Eleven Reasons to use Haskell as a Mathematician
- Laws of Form: An Opinion
- A-algebras and group cohomology
- Prototyping thought
- Computational Group Theory in Haskell
- Carry bits and group cohomology
- Polynomials as numbers
- Non-standard analysis, automatic differentiation, Haskell
- Feistel Ciphers and DES in Haskell
- Arithmetic coding in Haskell
- Haskell for Maths: commutative algebra, combinatorics, number theory, and group theory
- Two-dimensional spatial hashing with space-filling curves
- Countable Ordinals in Haskell
- Polynomials as numbers
- The Division Bell
- Haskell, PDF and penrose tilings
- Overloading Haskell numbers
- Number theory
- Category theory 1
- Category theory 2

#### 22.2 Theorem proving

#### 22.3 Quantum computing

- The Essence of Quantum Computing
- Monads for vector spaces, probability and quantum mechanics pt. I
- Monads, Vector Spaces and Quantum Mechanics pt. II
- Independence, entanglement and decoherence with the quantum monad
- The Shor Quantum Error Correcting Code (and a Monad for Heat)
- The Frame Of Reference Monad

#### 22.4 Mathematics of Haskell

- Why isn't ListT list a monad?
- Reverse Engineering Machines with the Yoneda Lemma
- Variable substitution gives a...
- From Lb's Theorem to Spreadsheet Evaluation
- Games, Strategies and the Self-Composition of the List Monad.
- Programs are Proofs: Models and Types in Lambda Calculus
- Why Haskell?
- Don't need the Y combinator
- ML, Haskell and Coq
- Djinn, Coq, Monad and a bit of Haskell
- Category Theory and the category of Haskell programs

### 23 Testing, correctness and proofs

- Introduction to QuickCheck
- QuickChecking a window manager
- On Unit Testing and Type Safety
- Robustness and QuickCheck
- Does XMonad crash? On proving pattern coverage with Catch
- Preconditions on XMonad

### 24 Regular expressions

### 25 The foreign function interface

- Simple demonstration of Haskell FFI
- C and Haskell sitting in a tree
- Haskell and C: functions returning more than one value

### 26 Tips and tricks

### 27 Cabal and libraries

- Cabal and rpms
- Getting started with installing third-party Haskell packages
- The lambda revolution: how you can help
- The lambda revolution, Episode V, the deb strikes back
- Questions on Haskell Style (and Polynomials redux)
- Using the Haskell package system
- How To Install Haskell Haddock on Mac OS X