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Haskell is a pure functional programming language with a rich ecosystem of tools and libraries, however to unleash that power, you need a guide. Effective Haskell is that guide. Written by an engineer who understands how to apply Haskell to the real world and uses it daily to get practical work done, it is your ticket to Haskell mastery.

Effective Haskell: Solving Real-World Problems with Strongly Typed Functional Programming