Version 5.2 of Racket
Release Notes: 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.
Other releases
Release Notes: Extflonums (80-bit fp) are now supported on some x86/x86_64 platforms. On Mac OS X, DrRacket and other apps are now signed. Tally Maze, a new game based an maze enumerations, was added. The Optimization Coach has been moved from the Racket distribution to the a package. The 'srfi/19' library is now compatible with the date structure type exported by 'racket/base'.
Release Notes: This is a bugfix release to address a flaw in 5.3.2 concerning interactions between the contour window and the syntax coloring.
Release Notes: New libraries: math, file/untar, file/untgz, file/unzip, and data/bit-vector. A new 'lazy-require' form. Extensions to 'racket/generic' and 'openssl'. A new package system (in beta). A more responsive GUI. auto-parens has been improved. Scribble can render markdown. Documentation cross-reference information is stored in an SQLite3 database. TR-friendly 'plot/typed' and delimited continuation.
Release Notes: This release features an improved 'case' form, a new 'racket/format' library, improved logging tools, extended 'for' forms, support for configuring bytecode paths using the PLTCOMPILEDROOTS environment variable, Check Syntax, which summarizes docs and runs continuously for '#lang' programs, DrRacket, which spell-checks strings, improvements to Typed Racket contracts, the inclusion of NaN in all floating-point types, a new 'cast' form for higher-order types, new ':query-type/args' and ':query-type/result' utilities, a new 'compatibility' collection for legacy functionality, and a port of FrTime to racket '#lang'. The 'planet' command line is deprecated: use 'raco planet'.
Release Notes: Submodules are nested module declarations that can be used independently from the enclosing module. Futures visualizer is a graphical profiling tool for parallel programs using futures. Optimization coach reports information about Racket's inlining optimizations. New libraries: JSON, images/flomap, and racket/generic. Racket/string is extended with simplified functions. The class form supports abstract methods. Contracts support interfaces, generics, prompts, continuation-marks, and structs. A new multi-line format for error messages. A new `ffi/com' library replaces MysterX. Completion code for zsh.
