Tags: seckcoder/racket
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Racket v6.0.1
* A new `racket/undefined` library exports `undefined` as the value
currently produced by
(letrec ([x x]) x)
This library anticipates a future where that expression will raise
an exception. The `racket/undefined` library will continue to offer
the `undefined` value as a bridge between versions and as a last
resort.
* The drawing and GUI libraries provide improved support for
high-resolution bitmaps and their use on Retina displays. For
example, `read-bitmap` includes a `#:try-@2x?` option to trigger
substitutions through the usual "@2x" naming convention.
* Check Syntax cooperates with Typed Racket to show arrows and other
Check Syntax highlighting even when there is a type error.
* Functions provided via contract-out that have first-order contracts
perform better.
* The contract boundary between typed/untyped modules is much less
expensive. Typed Racket now avoids generating contracts for places
where contracts failures cannot happen.
* Occurrence typing now works better with when/unless. Example:
(let ((x (read)))
(unless (number? x) (error 'bad-input))
(add1 x))
* Types in Typed Racket are now pretty-printed.
* Function types can now be written in prefix style, which is now
preferred and is used for printing. Infix function types are still
accepted for backwards compatibility.
* A new `->*' type constructor is used for writing types for functions
with optional and keyword arguments. The notation is similar to the
matching contract combinator.
* Typed Racket forms do not have a `:' suffix by default now. For
example, the `struct' form replaces `struct:'. The suffixed versions
are all provided for backwards compatibility.
* Typed Racket now has preliminary support for classes and
objects. However, it is still experimental and the APIs are subject
to change.
* Type aliases in Typed Racket now support recursion and mutual
recursion. For example, `(define-type (MyList X) (U Null (Pair X
(MyList X))))' is now a valid type alias.
* Plot correctly renders intersecting 3D graphs and non-grid-aligned
3D rectangles.
* Elements in plots output in PDF/PS format have the same relative
scale as in other formats. In particular, it is not necessary to
adjust `plot-font-size` to make PDF plots look the same as PNG.
Racket v6.0 Racket 6.0 has a new package system, including a catalog of hundreds of already-available packages. Please visit http://pkgs.racket-lang.org/ for an overview of the packages. Racket versions 5.3.4 through 5.3.6 included "beta" versions of the package system. Racket version 6.0 incorporates many improvements suggested by preliminary experiences in those versions: * A package is treated as a single collection by default, so it is even easier to use a GitHub repository as a package. Get started quickly: http://docs.racket-lang.org/pkg/getting-started.html * DrRacket includes a new package manager GUI, available via the File|Package Manager ... menu item. The GUI is also available as a stand-alone program via the "gui-pkg-manager" package. * The main Racket distribution has been separated into about 200 packages. The Racket installer combines the core system with bundled versions of these packages. Alternatively, you may now install a Minimal Racket distribution --- which is about 1/10 the size of the main distribution --- and add only those packages that you need. * Package installation supports pre-built packages that include compiled byte code and rendered documentation, meaning packages can be installed quickly when built versions are available. All packages in the main distribution are available in pre-built form. The recent 5.92 and 5.93 releases served as release candidates for 6.0, and 6.0 includes a few additional repairs related to the package system. Further improvements to the package system are in the works, notably including package documentation on the package-catalog web site. COMPATIBILITY NOTE: PLaneT, the previous Racket package system, will remain in place for the foreseeable future, but we expect all package work to shift to the new system. Beyond the package system, this release brings a number of other changes: * Racket's HTML documentation has a new and improved look, thanks to Matthew Butterick. * The documentation includes a style guide, "How to Program Racket" http://docs.racket-lang.org/style/ * Racket's JIT compiler supports the ARM architecture. * Racket supports the Mac's Retina display mode. * The performance of the Typed Racket compiler improved by 50% on some typed programs; e.g., see http://bit.ly/1d0Ye4z * The profiler provides a new mode that uses the errortrace library to produce fine-grained profiles. * A new contract profiler reports how much time programs spend checking contracts, and which contracts are most expensive. * The math/flonum library exports fast 105-bit precision operations. * Check Syntax handles generated identifiers, especially those introduced by struct (e.g. field selectors) and Redex (e.g., e_1, e_2) * 2htdp/batch-io includes functions for dealing with html/xml in files and web sites as X-expressions plus conveniences for web-based graph traversals. * The `gen:set' generic interface extends set operations to work on user-defined types that implement set methods, as well as on other set-like built-in types, such as lists. * Picts support conversion to SVG format. * Under unix, Racket provides desktop entries (.desktop files) for its graphical executables.
Racket v5.93 Version 5.93 repairs a few problems with the recent v5.92 release (in preparation for a v6.0 release): * fixed a low-level concurrency problem with the GUI library for Mac OS X, which especially affected 32-bit builds; * fixed GRacket-based launchers (such as `drracket`) in a Unix-style installation; * expanded the list of recognized OpenSSL library versions; * fixed small CSS problems and inconsistencies (relative to v5.3.6) in the new Scribble style as used by the Racket documentation; and * added the version number back to the "racket" directory within the source distribution bundle.
Racket v5.92 Racket 5.92 has a new package system, including a catalog of hundreds of already-available packages. Please visit http://pkgs.racket-lang.org/ for an overview of the packages. Recent releases included the "beta" versions of the package system. Racket version 5.92 incorporates many improvements suggested by these preliminary experiences: * A package is treated as a single collection by default, so it is even easier to use a Github repository as a package. Get started quickly: http://docs.racket-lang.org/pkg/getting-started.html * DrRacket includes a new package manager GUI, available via the File|Package Manager ... menu item. The GUI is also available as a stand-alone program via the "gui-pkg-manager" package. * The main Racket distribution has been separated into about 200 packages. The Racket installer combines the core system with bundled versions of these packages. Alternatively, you may now install a Minimal Racket distribution --- which is about 1/10 the size of the main distribution --- and add only those packages that you need. * Package installation supports pre-built packages that include compiled byte code and rendered documentation, meaning packages can be installed quickly when built versions are available. All packages in the main distribution are available in pre-built form. Further improvements are in the works, notably including package documentation on the package-catalog web site. COMPATIBILITY NOTE: PLaneT, the previous Racket package system, will remain in place for the foreseeable future, but we expect all package work to shift to the new system. Beyond the package system, this release brings a number of other changes: * Racket's HTML documentation has a new and improved look, thanks to Matthew Butterick. * The documentation includes a style guide, "How to Program Racket" http://docs.racket-lang.org/style/ * Racket's JIT compiler supports the ARM architecture. * Racket supports the Mac's Retina display mode. * The performance of the Typed Racket compiler improved by 50% on some typed programs; e.g., see http://bit.ly/1d0Ye4z * The profiler provides a new mode that uses the errortrace library to produce fine-grained profiles. * A new contract profiler reports how much time programs spend checking contracts, and which contracts are most expensive. * The math/flonum library exports fast 105-bit precision operations. * Check Syntax handles generated identifiers, especially those introduced by struct (e.g. field selectors) and Redex (e.g., e_1, e_2) * 2htdp/batch-io includes functions for dealing with html/xml in files and web sites as X-expressions plus conveniences for web-based graph traversals. * The `gen:set' generic interface extends set operations to work on user-defined types that implement set methods, as well as on other set-like built-in types, such as lists. * Picts support conversion to SVG format. * Under unix, Racket provides desktop entries (.desktop files) for its graphical executables.
Racket v5.3.5 This is a special-purpose release to match the arrival of "Realm of Racket" in bookstores. Racket v.5.3.5 adds a single `realm' collection to the v5.3.4 release. The new collection contains the source code that readers of Realm may wish to use for experiments.
Racket v5.3.4 * Extflonums (80-bit floating-point numbers) are supported on some x86/x86_64 platforms -- including Windows, and including platforms where Racket is compiled to use SSE instructions for flonum arithmetic. Thanks to Michael Filonenko. * OS X: DrRacket and all of the other apps are now signed with an official key. * Tally Maze: a new game based an enumeration of 2d mazes. * The Optimization Coach, a DrRacket plugin, has been moved from the Racket distribution to the Racket package repository. Install it with: raco pkg install optimization-coach * Redex: `define-union-language' now merges productions when languages define the same nonterminals. Thanks to William Bowman. * The `srfi/19' library is now compatible with the date structure type exported by `racket/base'.
Racket v5.3.2 Core Libraries: * The new `math' library provides functions and data structures for working with numbers and collections of numbers. Functions include non-elementary (such as gamma, zeta, Lambert's W), number-theoretic (factorization, modular arithmetic), linear algebra (arithmetic, decompositions), and statistical (expected values, order statistics, binning). Data structures include arbitrary-precision bigfloats, probability distributions, and multidimensional arrays. * The new `file/untar', `file/untgz', and `file/unzip' libraries support unpacking widely used archive formats. * The new `lazy-require' form allows programs to delay the loading and instantiation of helper modules until they are needed. * The new `data/bit-vector' library provides an implementation of bit vectors (a mutable sequence of booleans) supporting popcount. * The `racket/generic' library allows the specification of default method implementations for core datatypes. * The `openssl' library can verify hostnames and use the operating system's certificate store to verify certificates. Package System: * A new package system is in beta release. This system will become Planet's successor. It differs significantly from the latter. For details, please read the documentation at http://docs.racket-lang.org/planet2/ and list your packages on the new index at https://pkg.racket-lang.org/. * The `raco test' command supports testing by collection and package, in addition to by directory and file, with the "-c" and "-p" options. Teaching Libraries: * batch-io: the read and write functions work on Unix-style standard input and output. DrRacket: * DrRacket's GUI is more responsive. * The automatic parenthesis insertion mode is improved. Scribble: * Scribble renders Markdown format files via the "--markdown" command-line flag. Example use case: Generate documentation hosted on GitHub or BitBucket. * Documentation cross-reference information is stored in an SQLite3 database, which means that SQLite3 is required for building Racket documentation on Unix/Linux machines (but SQLite3 is included in Racket distributions for Windows and Mac OS X). Using a database for cross-reference information significantly reduces the initial footprint of DrRacket, since DrRacket no longer needs to load all cross-reference information. Typed Racket: * Typed Racket programs can require `plot/typed' to draw plots. List- and vector-accepting functions accept general sequences. * Typed Racket supports Racket's delimited continuation and continuation mark operators. Redex: * Added more support for `define-judgment-form', including random generation for well-formed judgments and visualization of judgments. Deprecation: The following have been removed in this release: * the `planet' command-line tool; use `raco planet' instead. The following has been deprecated and will be removed in the August 2013 release: * the `mzlib/class100' library; use `racket/class' instead.
Racket v5.3.1 Racket: * The `case' form dispatches on characters, fixnums, symbols, and keywords in logarithmic time. (Thanks to Jon Zeppieri.) * The new `racket/format' library provides new and improved string-formatting functions. * Logging tools include improved filtering support based on the name of a logger. A new `define-logger' form simplifies the use of named loggers. Forms such as `log-debug' now support string formatting. * The `for' forms now support `#:break' and `#:final' clauses. * The new PLTCOMPILEDROOTS environment variable configures the search path for compiled bytecode. DrRacket: * Check Syntax now summarizes the documentation (i.e., the blue boxes) for the identifier at the insertion point in the top-right corner of the definitions window. * Check Syntax now runs continuously for programs that declare their language within the source. This mode has been available for several of the past releases, but now enabled by default. * DrRacket can spell-check string constants (enable this in the Edit menu). Typed Racket: * Typed Racket interprets the Any type as a different contract. This may signal dynamic errors in some existing mixed typed/untyped programs. The normal fix is to replace a use of Any with a more specific types. * NaN is included in all of Typed Racket's floating-point types, which makes precise floating-point types easier to use. * Typed Racket supports a `cast' operation with support for higher-order types. * Typed Racket provides the `:query-type/args' and `:query-type/result' utilities to explore types at the REPL. Miscellaneous: * The `compatibility' collection provides features from Racket relatives, such as `defmacro' and mutable lists. These features are provided to ease porting code to Racket. Avoid them in modern Racket code. * Screenshots of the widgets provided by the Racket GUI library are included in the documentation. (Thanks to Diogo F. S. Ramos.) * FrTime was ported to racket lang. (Thanks to Patrick Mahoney.) Deprecation: The following has been deprecated and will be removed in the January 2013 release: * the `planet' command-line tool; use `raco planet' instead. The following has been deprecated and will be removed in the August 2013 release: * the `mzlib/class100' library; use `racket/class' instead.
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