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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