Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In the theory of programming languages in computer science, parametricity is a theoretical result that states that functions that have types that are related to each other share certain properties in common.Parametricity is the basis for many program transformations implemented in compilers for the Haskell programming language. These transformations were traditionally thought to be correct in Haskell because of Haskell's non-strict semantics. Despite being a lazy programming language, Haskell does support certain primitive operations — such as the operator seq — that enable so-called "selective strictness", allowing the programmer to force the evaluation of certain expressions.

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