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What is Haskell used for in the real world? [closed] Ask Question

tag-icon • tag-icon haskell functional-programming programming-languages
What is Haskell used for in the real world? [closed] Ask Question

There is a lot of hype around Haskell, however, it is hard to get information on how it is used in the real world applications. What are the most popular projects / usages of Haskell and why it excels at solving these problems?

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What are some common uses for this language?

Rapid application development.

If you want to know "why Haskell?", then you need to consider advantages of functional programming languages (taken from https://c2.com/cgi/wiki?AdvantagesOfFunctionalProgramming):

  • Functional programs tend to be much more terse than their ImperativeLanguage counterparts. Often this leads to enhanced programmer productivity

  • FP encourages quick prototyping. As such, I think it is the best software design paradigm for ExtremeProgrammers... but what do I know?

  • FP is modular in the dimension of functionality, where ObjectOrientedProgramming is modular in the dimension of different components.

  • The ability to have your cake and eat it. Imagine you have a complex OO system processing messages - every component might make state changes depending on the message and then forward the message to some objects it has links to. Wouldn't it be just too cool to be able to easily roll back every change if some object deep in the call hierarchy decided the message is flawed? How about having a history of different states?

  • Many housekeeping tasks made for you: deconstructing data structures (PatternMatching), storing variable bindings (LexicalScope with closures), strong typing (TypeInference), GarbageCollection, storage allocation, whether to use boxed (pointer-to-value) or unboxed (value directly) representation...

  • Safe multithreading! Immutable data structures are not subject to data race conditions, and consequently don't have to be protected by locks. If you are always allocating new objects, rather than destructively manipulating existing ones, the locking can be hidden in the allocation and GarbageCollection system.

Apart from this Haskell has its own advantages such as:

  • Clear, intuitive syntax inspired by mathematical notation.
  • List comprehensions to create a list based on existing lists.
  • Lambda expressions: create functions without giving them explicit names. So it's easier to handle big formulas.
  • Haskell is completely referentially transparent. Any code that uses I/O must be marked as such. This way, it encourages you to separate code with side effects (e.g. putting text on the screen) from code without (calculations).
  • Lazy evaluation is a really nice feature:
    • 通常であればエラーが発生するような場合でも、結果を使用しない限りは機能します。たとえば、1 / 0リストの最初の項目として配置し、2 番目の項目のみを使用した場合でも機能します。
    • このような検索プログラムを書くのは簡単です数独ソルバーすべての組み合わせを一度に読み込むのではなく、実行しながら生成するだけです。他の言語でもこれを行うことができますが、これをデフォルトで実行するのは Haskell だけです。

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