The 16th International Workshop on Implementation and Application of Fu- tional Languages (IFL 2004) was held in Lub ̈ eck, Germany, September 8–10, 2004. It was jointly organized by the Institute of Computer Science and Applied Mathematics of the University of Kiel and the Institute of Software Technology and Programming Languages of the University of Lub ̈ eck. IFL 2004 was the sixteenth event in the annual series of IFL workshops. The aim of the workshop series is to bring together researchers actively engaged in the implementation and application of functional and function-based progr- ming languages. It provides an open forum for researchers who wish to present and discuss new ideas and concepts, work in progress, preliminary results, etc., related primarily, but not exclusively, to the implementation and application of functional languages. Topics of interest cover a wide range from theoretical - pects over language design and implementation towards applications and tool support. Previous IFL workshops were held in the United Kingdom (Southampton, Norwich, London, St Andrews, and Edinburgh), in the Netherlands (Nijmegen and Lochem), in Germany (Aachen and Bonn), in Sweden (B? astad and Sto- holm), and in Spain (Madrid). In 2005, the 17th International Workshop on - plementation and Application of Functional Languages will be held in Dublin, Ireland.

This book constitutes the thoroughly refereed post-proceedings of the 20th International Workshop on Implementation and Applications of Functional Languages, IFL 2008, held in Hatfield, UK, in September 2008. The 15 revised full papers presented were carefully reviewed and selected from 31 submissions. Topics of interest cover a wide range from novel language designs, theoretical underpinnings, compilation and optimisation techniques for diverse hardware architectures, to applications, programming techniques and novel tools.

This book constitutes the thoroughly refereed post-conference proceedings of the 22nd International Symposium on Implementation and Applications of Functional Languages, IFL 2010, held in Alphen aan den Rijn, The Netherlands, in September 2010. The 13 revised full papers presented were carefully reviewed and were selected from 31 submissions. The IFL symposia bring together researchers and practitioners that are actively engaged in the implementation and the use of functional and function based programming languages. Every year IFL provides a venue for the presentation and discussion of new ideas and concepts, of work in progress, and of publication-ripe results.

This book contains the selected peer-reviewed and revised papers from the 24th International Symposium on Implementation and Application of Functional Languages, IFL 2012, held in Oxford, UK, in August/September 2012. The 14 papers included in this volume were carefully reviewed and selected from 28 revised submissions received from originally 37 presentations at the conference. The papers relate to the implementation and application of functional languages and function-based programming.

This volume constitutes the post-proceedings of the 18th International Workshop on Implementation and Applications of Functional Languages. Fifteen full papers are presented. Each one was submitted to two rounds of reviews to ensure accuracy, thoroughness, and readability. The papers address all current theoretical and methodological issues in functional and function-based languages.

This book constitutes the thoroughly refereed post-conference proceedings of the 23rd International Symposium on Implementation and Application of Functional Languages, IFL 2011, held in Lawrence, Kansas, USA, in October 2011. The 11 revised full papers presented were carefully reviewed and selected from 33 submissions. The papers by researchers and practitioners who are actively engaged in the implementation and the use of functional and function based programming languages describe practical and theoretical work as well as applications and tools. They discuss new ideas and concepts, as well as work in progress and results.

This book constitutes the thoroughly refereed post-proceedings of the 21st International Workshop on Implementation and Applications of Functional Languages, IFL 2000, held in South Orange, NJ, USA, in September 2009. The 13 revised full papers presented were carefully reviewed and were selected from numerous submissions. The IFL symposia bring together researchers and practitioners that are actively engaged in the implementation and the use of functional and function based programming languages. Every year IFL provides a venue for the presentation and discussion of new ideas and concepts, of work in progress, and of publication-ripe results.

This book constitutes the thoroughly refereed post-proceedings of the 17th International Workshop on Implementation and Applications of Functional Languages, IFL 2005, held in Dublin, Ireland in September 2005. Ranging from theoretical and methodological topics to implementation issues and applications in various contexts, the papers address all current issues on functional and function-based languages.

This book constitutes the thoroughly refereed post-proceedings of the 19th International Workshop on Implementation and Applications of Functional Languages, IFL 2007, held in Freiburg, Germany in September 2007. The 15 revised full papers presented went through two rounds of reviewing and improvement and were selected from 33 submissions. The papers address all current theoretical and methodological issues on functional and function-based languages such as type checking, contract checking, compilation, parallelism, development and debugging, data structures, parsing as well as various performance related concepts.

This book constitutes the thoroughly refereed post-proceedings of the 15th International Workshop on the Implementation of Functional Languages, IFL 2003, held in Edinburgh, UK in September 2003. The 11 revised full papers presented were carefully selected during two rounds of reviewing and revision from 32 workshop presentations. The papers are organized in topical sections on language constructs and programming, static analysis and types, parallelism, and generic programming.