Haskell is a programming language that has a strong focus on functional programming concepts, such as immutability and higher-order functions. While it has a dedicated following among programmers who value its expressive power and safety guarantees, it can also be seen as controversial for a few reasons:

First, Haskell can have a steep learning curve for programmers who are used to imperative or object-oriented programming languages, due to its unique syntax and emphasis on a functional programming paradigm.

Second, Haskell can be seen as impractical for certain kinds of programming tasks, particularly those that require a lot of mutable state or low-level system access.

Finally, Haskell is sometimes criticized for having a smaller ecosystem of libraries and tools compared to more mainstream programming languages like Python or JavaScript, which can make it less appealing for some developers who value ease of use and community support.

That being said, Haskell has a dedicated and passionate community of developers who believe that its unique features and strong guarantees make it well worth learning for certain types of programming tasks.
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