All edits are in this version.
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Release highlights:
* The new `db' library offers a high-level, functional interface to
popular relational database systems, including PostgreSQL, MySQL,
and SQLite, as well as other systems via ODBC.
* A new XREPL collection provides convenient commands for a plain
racket REPL. It is particularly convenient for people who prefer
console-based work and alternative editors. See also the new
chapter on command-line tools and other editors at the end of the
Racket Guide.
* The `plot' collection has been reimplemented in Racket. It now
offers PDF output, log axes, histograms, and more. Some code that
uses `plot' will still work, and some will need light porting.
The `plot/compat' module offers expedient backward compatibility.
* DrRacket uses more conventional key bindings: `C-t' creates a new
tab, `C-w' closes the current one, and `C-r' runs the definitions.
On Mac OS X, the Command key is used. See "Defining Custom
Shortcuts" in the DrRacket manual for an example that uses the old
key bindings.
* The new `raco link' command registers a directory as a collection,
which allows the collection directory to reside outside the
"collects" tree and without changing the PLTCOLLECTS environment
variable.
* Support for `begin-for-syntax' has been generalized; modules may
now define and export both value bindings and syntax bindings
(macros) at phase 1 and higher.
* Typed Racket:
- Typed Racket provides static performance debugging support to
show which code gets optimized and point out code that does not.
Use the "Performance Report" button in DrRacket.
- More intuitive types in printouts in the REPL and in error
messages. Use `:query-result-type' to explore types, or
`:print-type' for a full printout.
- Function definitions with optional arguments now work.
- Typed Racket now supports defining function with optional
arguments using the same syntax as Racket.
* Redex now supports specifying (and testing and automatically
typesetting) judgment forms including type systems and SOS-style
operational semantics.
* Fixed several GUI problems, including problems on Ubuntu 11.10
(GTK+ 3) and 64-bit Mac OS X.
* Internal-definition expansion has changed to use `let*' semantics
for sequences that contain no back references. This change
removes a performance penalty for using internal definitions
instead of `let' in common cases, and it only changes the meaning
of programs that capture continuations in internal definitions.
Internal definitions are now considered preferable in style to
`let'.
Additional items:
* DrRacket comes with an experimental, on-line check syntax
function. By default, it is turned off. To turn it on, right
click on the red circle in the buttom right corner of the DrRacket
window. Warning: turning this on makes DrRacket less stable.
* The `racket/gui' library (and Slideshow) provides more support for
multiple-screen displays.
* DrRacket remembers whether an opened file used LF or CRLF line
endings, and will continue using the same. When creating a new
file, a preference determines how it is saved.
* `net/url' can now follow HTTP redirections.
* The LNCS and JFP class files are no longer distributed with
Racket. Instead, they are downloaded on demand.
* The Algol language implementation is now available as a plain
language using `#lang algol60'.
* The Racket-to-C compiler (as accessed via `raco ctool' or `mzc')
has been removed; Racket's JIT has long provided better
performance, and the FFI provides better access to C libraries.
* Contracts can be applied to exports with the new `contract-out'
form within `provide', instead of a separate `provide/contract'
form. (The new `contract-out' form is implemented as a new kind
of "provide pre-transformer".)
* The `date*' structure type is an extension of `date' with
`nanosecond' and `time-zone-name' fields.
* New looping constructs: `for/sum' and `for/product'.
* Direct calls to keyword-accepting functions are now optimized to
eliminate the overhead of keywords. In addition, the compiler
detects and logs warnings for keyword-argument mismatches.
* The libfit interface is available from `plot/deprecated/fit', and
will be removed in the near future.
* The Unix installer has been re-done, and it is now more robust.
* The built-in reader and printer support for Honu is removed.
(This functionality is re-implemented in Racket.)
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--
((lambda (x) (x x)) (lambda (x) (x x))) Eli Barzilay:
http://barzilay.org/ Maze is Life!
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