Your address book is inside the function. Place it outside. (Well that's a
hunch of having seen many solutions like that.)
-- Matthias
On Dec 9, 2010, at 5:33 PM, Ken Hegeland wrote:
> I am working on 39.1.8 of HTDP
> http://htdp.org/2003-09-26/Book/curriculum-Z-H-49.html#node_sec_39.1
>
I am working on 39.1.8 of HTDP
http://htdp.org/2003-09-26/Book/curriculum-Z-H-49.html#node_sec_39.1
I have the gui all set up. The examples in the book use:
(define friends
(make-address-book "friends"))
and then applies friends to the argument, 'add, or 'search.
My thought was a basic list proce
On 12/09/2010 12:48 PM, Luke Jordan wrote:
I will look at for and in-range and spend some more time exploring the
built-ins. But I want to talk about the do-times solution, because that
was the first thing I tried, but I couldn't make it work. In chapter 11
expression arguments are applied to s
On Thu, Dec 9, 2010 at 11:48 AM, Luke Jordan wrote:
> I don't understand how that applies to
> what I'm trying to do here since I'm not building anything, just calling it
> over and over and ignoring the result.
Right. Timing something is definitely `non-functional' (there is an obvious
implici
On Thu, Dec 09, 2010 at 12:51:12PM -0600, Luke Jordan wrote:
> Here's a rookie question that stems from HtDP 29.3.2.
>
> The idea is to test an expression a number of times while timing it and
> compare to another version of the same function.
There are practical problems:
Timers on computers ar
I will look at for and in-range and spend some more time exploring the
built-ins. But I want to talk about the do-times solution, because that was
the first thing I tried, but I couldn't make it work. In chapter 11
expression arguments are applied to something that builds up a result (as a
list o
On Thu, Dec 9, 2010 at 2:12 PM, Matthias Felleisen wrote:
>> (do ([x 10 (- x 1)]) ((zero? x)) (displayln x))
(for ([x (in-range 10 0 -1)]) (displayln x))
Also, it would be nice if the default `step' value for `in-range' was:
(if (<= start end) 1 -1)
Then my program would be 3 characters shor
Ryan said it all. But since I decided to check on the long-forgotten do loops,
I thought I'd show you the one-liner:
> (do ([x 10 (- x 1)]) ((zero? x)) (displayln x))
10
9
8
7
6
5
4
3
2
1
Loops are ugly -- Matthias
On Dec 9, 2010, at 1:51 PM, Luke Jordan wrote:
> Here's a rookie question
On 12/09/2010 11:51 AM, Luke Jordan wrote:
Here's a rookie question that stems from HtDP 29.3.2.
The idea is to test an expression a number of times while timing it and
compare to another version of the same function. The expression finds a
route in a vector (graph) from node 0 to node 4. Th
On Dec 9, 2010, at 1:51 PM, Luke Jordan wrote:
> Here's a rookie question that stems from HtDP 29.3.2.
>
> The idea is to test an expression a number of times while timing it and
> compare to another version of the same function. The expression finds a
> route in a vector (graph) from node 0
Here's a rookie question that stems from HtDP 29.3.2.
The idea is to test an expression a number of times while timing it and
compare to another version of the same function. The expression finds a
route in a vector (graph) from node 0 to node 4. The way I would do this in
C/Python is with a whi
On Wed, 8 Dec 2010 16:13:08 -0500
Matthias Felleisen
wrote:
>
>
>
> Here is a version with 'type' annotations that should be easier to
> read and learn from.
>
> #lang racket
>
> ;;
> -
> ;;
> library module
>
>
=
Call for Papers
ICFP 2011: International Conference on Functional Programming
Tokyo, Japan, Monday 19 -- Wednesday 21 September 2011
http://www.icfpconference.org/icfp2011
===
13 matches
Mail list logo
