Real-world examples of Haskell in action

Haskell is a programming language that is known for its elegance and expressiveness. It was first developed in the late 1980s by a group of researchers from the University of Glasgow, and since then, it has become a popular choice for a wide range of applications.

In this article, we will explore some real-world examples of Haskell in action. Let's dive in!

1. Banking and Finance

One of the industries where Haskell has been widely adopted is banking and finance. Haskell's strong type system and static analysis capabilities make it an ideal choice for developing financial applications that require robustness and reliability.

One such example is the HQuant library, which provides a comprehensive set of financial functions and data types that can be used to build scalable and reliable financial systems. HQuant has been used by several financial institutions, including Credit Suisse and Barclays, for building trading and risk management systems.

Another example is the Tsuru Capital hedge fund, which has exclusively used Haskell for developing its trading platform. The fund's founder, John Mount, commented in a blog post that Haskell's type safety features and ease of refactoring were critical in enabling his team to build complex algorithms quickly and safely.

2. Telecommunications

Haskell's focus on correctness, safety, and maintainability makes it an ideal choice for building software in telecommunications. One notable example is Ericsson's use of Haskell in its products.

Ericsson has been using Haskell for over a decade for developing tools and software that analyze and optimize telecommunication networks. The company's team discovered that Haskell's static analysis features enabled them to catch errors early, which reduced development time, minimized software failures, and improved overall system performance.

3. Space Exploration

Haskell has also been used in the space industry for building complex and robust software systems. For instance, the Galois company used Haskell to build an autonomous spacecraft mission control system for NASA's Jet Propulsion Laboratory.

The mission control system, named SMACCMPilot, was developed to control a small unmanned aircraft in a space exploration mission. The Galois team found that Haskell's expressiveness and strong type system allowed them to write clean and maintainable code that could be easily tested and refactored as needed.

4. Machine Learning

Haskell's functional paradigm and strong static typing make it an ideal choice for developing machine learning algorithms. One of the more popular libraries is HLearn, which provides a suite of machine learning algorithms that can be used to form predictions and categorize data.

HLearn has been used by several companies, including Takt AI, for developing machine learning models for image and speech recognition. The team at Takt AI found that Haskell's type safety and functional purity helped them to produce efficient and reliable machine learning models that were easy to maintain and update.

5. Game Development

Haskell has also been used to develop games, which is quite an achievement considering the performance-critical nature of the industry. One such example is the game engine, LambdaCube 3D.

LambdaCube 3D is a pure Haskell game engine that enables developers to write high-performance 3D graphics applications in a functional style. It has been used by several indie game developers, including Ansimuz Games and Cinnamon Beard, to build games that are cross-platform, responsive, and engaging.

6. Education

Finally, Haskell has proved to be a strong educational tool that enables students to learn programming concepts in a clear and concise manner. Several universities, including Stanford and UC Berkeley, offer courses on Haskell.

At Harvard University, a new introductory course was developed in 2018 that teaches undergraduate students the fundamentals of programming using Haskell. The course's creator, Greg Morrisett, said that Haskell's focus on abstraction, modularity, and composability was appealing to educators as it enabled students to develop a deep understanding of programming concepts that could be transferred to other languages and domains.


In conclusion, Haskell is a versatile language that has been used successfully in a wide range of domains. Its focus on correctness, safety, and maintainability make it an ideal choice for developing software that is scalable, reliable, and efficient.

From banking and finance to space exploration and game development, Haskell's power and elegance have been demonstrated time and time again. Its popularity continues to grow, and we can expect to see more and more real-world examples of Haskell in action in the future.

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