Haskell

Haskell is a way to talk to computers.

It helps people write rules for machines. People use it for work and school.

This way of talking is very special. It uses math to help the computer work. The computer can wait to do a task until it is truly needed. This is called lazy work.

It also helps keep things neat. It uses rules to make sure the code is right. This stops mistakes before they happen.

Many people help make it better. A big group of people works on it. They make sure it stays strong for everyone to use.

It is a very smart way to work. Do you want to learn more?

Haskell is a special way to talk to computers.

People use it for school and for work. It is a functional language. This means it uses math to solve problems. Most functions in Haskell do not have side effects. A side effect is when a task changes something else by mistake. Haskell keeps things neat to help avoid these errors.

Haskell has a very smart system. It uses type classes. These are sets of rules that help the computer understand different kinds of data. It also uses lazy evaluation. This is a way of working where the computer waits to do a task until it is truly needed. This can save power and time.

A group of people worked together to make Haskell an open standard. This means anyone can use it. One main tool used to run Haskell is the Glasgow Haskell Compiler. We call this GHC for short. GHC is very fast. It can run on many different types of computers. There are also over 5,400 tools and libraries that people have made for Haskell. These help people do even more with the language.

Haskell is a special way to talk to computers.

It is a general-purpose programming language. This means people can use it for many different jobs. It is a purely functional language. In this way of working, functions usually have no side effects. A side effect is when a task changes something else by mistake. Haskell keeps things neat to help avoid these errors.

It is used in both schools and big businesses.

Haskell works using some very smart ideas. It uses lazy evaluation. This is a way of working where the computer waits to do a task until it is truly needed. This can save power and time. It also uses type classes. These are sets of rules that help the computer understand different kinds of data. Haskell uses something called a monad to handle tasks like errors. A monad is a framework that helps the computer manage different kinds of math problems.

Many people helped create this language. A group of experts met in 1987 in Portland, Oregon. They wanted to make an open standard for functional languages. They wanted to bring different ideas together into one common language. They named it after a logician named Haskell Curry. The first version, called Haskell 1.0, was defined in 1990. Later, they made a stable version called Haskell 98 in 1997.

There are many important facts about how Haskell is used today. The main tool to run it is the Glasgow Haskell Compiler, or GHC. GHC is the most common way to use the language. It can run on many different types of computer parts. There are more than 5,400 extra tools and libraries available on a site called Hackage. These tools help people do even more with their code. In 2010, the group released a new standard called Haskell 2010.

You can think of Haskell like a very organized set of math rules. Just as math follows strict steps, Haskell follows strict rules to stay neat. This helps programmers write code that is very reliable. Even though it is a special language, it connects to other ways of talking to computers. For example, it can use a tool called a foreign function interface. This lets Haskell work together with other languages like C. It is a powerful way to solve hard problems with math.

Haskell is a general-purpose, statically typed, and purely functional programming language. It is designed to be reliable and mathematically sound. In a purely functional language, functions generally have no side effects. A side effect occurs when a function changes something outside of its own local environment. Haskell uses a distinct construct to represent these side effects separately. This keeps the core logic of the code clean and predictable.

The language operates through several sophisticated mechanisms. It utilizes lazy evaluation, which means the computer waits to perform a calculation until the result is actually required. It also features type inference, which was originally based on Hindley-Milner type inference. This allows the computer to automatically figure out the data types being used. Another key feature is the use of type classes. These allow for type-safe operator overloading, which lets the same operator work with different types of data. To manage tasks like error handling or input/output, Haskell uses a framework called a monad. Monads allow the language to handle side effects while maintaining referential transparency.

Haskell's development has moved through several distinct stages and standards. The first version, Haskell 1.0, was defined in 1990. Early versions, up to 1.2, used unsatisfactory methods for handling input/output. Version 1.3 introduced monadic IO and generalized type classes. In 1997, the committee released Haskell 98. This was intended to be a stable, minimal, and portable version for teaching and research. In 2010, the Haskell 2010 standard was published. This version added hierarchical module names, such as Data.List, and a foreign function interface (FFI). The FFI allows Haskell to connect with other languages, specifically C. Most recently, the GHC2021 extension was released in October 2021 to combine many stable extensions.

The history of the language began with the release of Miranda in 1985. By 1987, many non-strict, purely functional languages existed, but Miranda was proprietary software. At a conference in Portland, Oregon, in 1987, experts agreed to form a committee. Their goal was to create an open standard to consolidate existing functional languages. This committee worked to bring various solutions together into one common language. They named the language after the logician Haskell Curry. The committee's work led to the various formal specifications used today.

Today, the Glasgow Haskell Compiler, or GHC, is the most important implementation. GHC is the de facto standard for the language. It acts as both an interpreter and a native-code compiler. It can run on many different processor architectures. GHC is also known for its high-performance handling of concurrency and parallelism. It uses an asynchronous runtime to schedule threads across multiple CPU cores. While Haskell is not the most common language, it remains significant. It was the 28th most popular language by Google searches for tutorials. However, it made up less than 1% of active users on GitHub.

There are many different ways to implement Haskell. Aside from GHC, there is the Utrecht Haskell Compiler (UHC), which is used for research. Another implementation is Jhc, which focuses on the speed of generated programs. There is also Ajhc, which is a fork of Jhc. Older implementations include the Haskell User's Gofer System, also known as Hugs. Hugs was a bytecode interpreter that was once widely used alongside GHC. These various tools allow researchers and developers to explore different aspects of functional programming.

Haskell connects deeply to broader fields of computer science and mathematics. Its structure is heavily influenced by mathematical logic. The use of monads allows it to model complex computations like nondeterminism and parsing. Through the foreign function interface, Haskell can interact with the widely used C language. The language also supports a massive ecosystem of tools. There are more than 5,400 third-party open-source libraries available in the Hackage repository. This allows the language to be used for everything from academic research to industrial applications.