Learn Haskell!

Haskell is a general-purpose, statically typed, purely functional programming language with type inference and lazy evaluation. Developed to be suitable for teaching, research and industrial application, Haskell has pioneered a number of advanced programming language features. Type classes, for example, enable type-safe operator overloading, were first proposed by Philip Wadler and Stephen Blott for Standard ML and were first implemented in Haskell. Haskell's main implementation is the Glasgow Haskell Compiler. It is named after logician Haskell Curry. Haskell's semantics are historically based on those of the Miranda programming language, which served to focus the efforts of the initial Haskell working group. The last formal specification of the language was made in July 2010, while the development of GHC's implementation has continued to extend Haskell via language extensions. The next formal specification is planned for 2020. Haskell is used in academia and industry. As of September 2019, Haskell was the 23rd most popular programming language in terms of Google searches for tutorials and made up less than 1% of active users on the GitHub source code repository. - read more on Wikipedia