Haskell has numerous extensions (Visit https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/ for a comprehensive list of extensions and features), which can be used through {-# LANGUAGE <pragma> #-}. In this chapter, we will be looking at some advanced GHC extensions, and advanced language features such as type-families, rank-n-types, existential types and Generic Algebraic Data Types (GADT). The selection is offered from a usefulness point of view, and it is in no way complete, but it should be representative.
United States
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Germany
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Canada
Russia
Spain
Brazil
Australia
Singapore
Hungary
Philippines
Mexico
Thailand
Ukraine
Luxembourg
Estonia
Lithuania
Norway
Chile
South Korea
Ecuador
Colombia
Taiwan
Switzerland
Indonesia
Cyprus
Denmark
Finland
Poland
Malta
Czechia
New Zealand
Austria
Turkey
Sweden
Italy
Egypt
Belgium
Portugal
Slovenia
Ireland
Romania
Greece
Argentina
Malaysia
South Africa
Netherlands
Bulgaria
Latvia
Japan
Slovakia