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This book constitutes the thoroughly refereed revised selected papers of the 19 th International Symposium on Trends in Functional Programming, TFP 2018, held in Gothenburg, Sweden, in June 2018. The 7 revised full papers were selected from 13 submissions and present papers in all aspects of functional programming, taking a broad view of current and future trends in the area. It aspires to be a lively environment for presenting the latest research results, and other contributions, described in draft papers submitted prior to the symposium.

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Colocation of Potential Parallelism in a Distributed Adaptive Run-time System for Parallel Haskell.- Reversible Session-Based Concurrency in Haskell.- Intrinsic Currying for C++ Template Metaprograms.- Towards Optic-Based Algebraic Theories: The Case of Lenses.- Saint: an API-generic Type-safe Interpreter.- Improving Haskell.- High-Performance Defunctionalisation in Futhark.

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