Creighton Kirkendall discusses how polymorphism is implemented in Clojure, Ocaml, Haskell and Scala.
Matthew Flatt introduces Racket, an extensible programming language useful to create new syntactic forms and construct entirely new programming languages.
Rob Pike explains how Google designed Go to address major development issues they encounter while using other languages: long build times, poor dependency management, lack of robustness, etc.
Ostap Cherkashin and Julius Chrobak present writing readable and extendable rich data manipulation code with Bandicoot.
Michael Fogus overviews Datalog and provides examples of how it is implemented and used in Datomic, Cascalog, and the Bacwn Clojure library.
Michael Homer introduces Grace, an educational OO language used to teach programming to students.
Stuart Williams discusses the merits of dynamic languages, definitions, stereotypes, myths, suggesting when and how to introduce such a language in production.
Leo A. Meyerovich explains how social adoption patterns can help language designers make new languages that are inherently attractive and desirable by developers.
Mehrdad Afshari introduces prorogued programming, a new programming paradigm based on 3 principles: proroguing concerns, hybrid computation and executable refinement.
José Valim introduces Elixir, a programming language for the Erlang VM – an attempt to provide better abstractions and productivity tools like protocols and macros usually required for web development.