On Jan 27, 2010, at 9:16 PM, Eli Barzilay wrote:
The release announcement sketch that I have so far is below. Please
mail me new items and/or edits. (This is close to the final version.)
The one item that is still missing, IMO, is:
* [Matthias] `error' in teaching languages? universe/world
changes?
`random', `gensym', `current-millisecond', `sleep', `assoc',
`with-i/o-from-to' added?
Robby had prose for error, and I agreed with it. The others aren't
worth mentioning.
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* The `scheme/flonum' and `scheme/fixnum' libraries provide flonum-
and fixnum-specific operations. In the case of flonum-specific
operations, the JIT compiler can recognize combinations of
operations (including local bindings) and improve performance by
"unboxing" intermediate results.
* The `scheme/unsafe/ops' library provides arithmetic and other
operations that are implemented without dynamic checks. Avoiding
checks can sometimes improve performance, but at the expense of
safety.
* 2htdp/universe: We have severed the intimate connection between
universe and the image library. The most important change is that
the design of world programs now demands the use of two
teachpacks: 2htdp/universe and htdp/image (the old image library)
or 2htdp/image (the new image library). Furthermore, the
callbacks for world programs no longer use symbols but strings.
The image functions are overloaded so that both strings and
symbols work as inputs.
For upgrading your world programs, see the new Porting World Programs
guide in the HtDP/2e section of the documentation.
* htdp/world: The old world teachpack remains deprecated. HtDP/2e
exclusively uses the new 2htdp/universe library. For backwards
compatibility, the world teachpack will remain in the distribution
until the coming summer.
* The scheme/class library now provides `this%', which refers to the
class of the current object (i.e. `this').
* `scheme/generator' has convenient functions for infinite
generators, and for converting a generator to a sequence for
iteration.
* PLT Scheme's add-on directory can be customized by the
$PLTADDONDIR environment variable or `--addon'/`-A' command-line
flags. This controls where downloaded Planet packages and their
compiled Scribble documentation are installed.
* Additional extensions include: saving `errno' in foreign calls,
much improved `sort' speed, normalized results from
`procedure-arity', and more.
----------------------------------------------------------------------
--
((lambda (x) (x x)) (lambda (x) (x x))) Eli
Barzilay:
http://barzilay.org/ Maze is
Life!
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