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Racket (formerly PLT Scheme) is a programming language suitable for implementation tasks ranging from scripting to application development, including GUIs, Web services, etc. It includes the DrRacket programming environment, a virtual machine with a just-in-time compiler, tools for creating stand-alone executables, the Racket Web server, extensive libraries, documentation for both beginners and experts, and more. It supports the creation of new programming languages through a rich, expressive syntax system. Example languages include Typed Racket, ACL2, FrTime, and Lazy Racket.

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2011-11-12 01:52 Back to release list
5.2

此版本添加了一个在线的检查语法定义、 新 db 库接口 PostgreSQL，MySQL，SQLite 和 ODBC，XREPL （提供方便平原的复制命令），在重新实现和扩展"情节"图书馆、 定义使用的更多常规密钥 （"C-t"为新的选项卡和"C-r"到运行），注册一个目录作为一个集合 （提供性能调试支持） 键入球拍的"瑞科链接"命令打印输出类型更直观、 带有可选参数的函数、 计算的表达式上下文 (支持指定的判断形式，包括类型的系统和操作语义)，和各种修复和改进。
标签: Major feature enhancements
This release adds an online check syntax in DrRacket, the new db library interfaces PostgreSQL, MySQL, SQLite, and ODBC, XREPL (providing convenient plain REPL commands), a reimplemented and extended "plot" library, DrRacket use of more conventional keys ("C-t" for a new tab and "C-r" to run), a "raco link" command which registers a directory as a collection, Typed Racket (providing performance debugging support), more intuitive type printouts, functions with optional arguments, Redex (supporting specifying judgment forms, including type systems and operational semantics), and various fixes and improvements.

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