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<p class="MsoNormal">Unfortunately, I have lost the original problem
specification, so I have answered a different question. Could you
please
help me by repeating the original problem specification in full?<br>
<br>
I agree that my solution is not 'obviously correct' since it
doesn't
answer the right question. In one version of the solution, I had a
prologue
that catered for spaces, etc. Not having a textual form of the
algorithm that provided
for the extensions, I chose to omit them.<br>
</p>
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<div class="moz-cite-prefix">On tirsdag.05.05.2020 15:20, Richard
O'Keefe wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CABcYAdJJFbmK08h-FvCZugB7+6csA-uggsAM-dzX8Jf-mZ00bA@mail.gmail.com">
<pre class="moz-quote-pre" wrap="">The irony is that the code I was responding to ISN'T obviously correct.
Indeed, I found it rather puzzling.
The problem specification says that the input string may contain digits
AND SPACES. The original message includes this:
Strings of length 1 or less are not valid. Spaces are allowed in the
input, but they should be stripped before checking. All other
non-digit characters are disallowed.
Now it isn't clear what "disallowed" means. I took it to mean "may occur and
should simply mean the input is rejected as invalid." Perhaps "may not occur"
was the intention. So we shall not quibble about such characters.
But I can't for the life of me figure out how Trygve's code checks for spaces.
One reason this is an issue is that the behaviour of #digitValue is not
consistent between systems.
Character space digitValue
does not exist in the ANSI standard
answers -1 in many Smalltalks (which is a pain)
answers a positive integer that can't be mistake for a digit in my Smalltalk
raises an exception in some Smalltalks.
This is a comment I now have in my Smalltalk library for #digitValue
"This is in the Blue Book, but unspecified on non-digits.
Squeak, Pharo, Dolphin, VW, VAST, and Apple Smalltalk-80
answer -1 for characters that are not digits (or ASCII letters),
which is unfortunate but consistent with Inside Smalltalk
which specifies this result for non-digits.
ST/X and GST raise an exception which is worse.
Digitalk ST/V documentation doesn't specify the result.
This selector is *much* easier to use safely if it
returns a 'large' (>= 36) value for non-digits."
Let's compare three versions, the two I compared last time,
and the "version A" code I discussed before, which to my mind
is fairly readable.
"Don't add slowness": 1 (normalised time)
"Trygve's code": 6.5
"High level code": 30.6 (or 4.7 times slower than Trygve's)
Here's the "High level code".
^(aString allSatisfy: [:each | each isSpace or: [each isDigit]]) and: [
|digitsReverse|
digitsReverse := (aString select: [:each | each isDigit]) reverse.
digitsReverse size > 1 and: [
|evens odds evenSum oddSum|
odds := digitsReverse withIndexSelect: [:y :i | i odd].
evens := digitsReverse withIndexSelect: [:x :i | i even].
oddSum := odds detectSum: [:y | y digitValue].
evenSum := evens detectSum: [:x |
#(0 2 4 6 8 1 3 5 7 9) at: x digitValue + 1].
(oddSum + evenSum) \\ 10 = 0]]
This is the kind of code I was recommending that Roelof write.
As a rough guide, by counting traversals (including ones inside existing
methods), I'd expect the "high level" code to be at least 10 times slower
than the "no added slowness" code.
We are in vehement agreement that there is a time to write high level
really obvious easily testable and debuggable code, and that's most
of the time, especially with programming exercises.
I hope that we are also in agreement that factors of 30 (or even 6)
*can* be a serious problem. I mean, if I wanted something that slow,
I'd use Ruby.
I hope we are also agreed that (with the exception of investigations
like this one) the time to hack on something to make it faster is AFTER
you have profiled it and determined that you have a problem.
But I respectfully suggest that there is a difference taking slowness OUT
and simply not going out of your way to add slowness in the first place.
I'd also like to remark that my preference for methods that traverse a
sequence exactly once has more to do with Smalltalk protocols than
with efficiency. If the only method I perform on an object is #do:
the method will work just as well for readable streams as for
collections. If the only method I perform on an object is #reverseDo:
the method will work just as well for Read[Write]Streams as for
SequenceReadableCollections, at least in my library. It's just like
trying to write #mean so that it works for Durations as well as Numbers.
Oh heck, I suppose I should point out that much of the overheads in
this case could be eliminated by a Self-style compiler doing dynamic
inlining + loop fusion. There's no reason *in principle*, given enough
people, money, and time, that the differences couldn't be greatly
reduced in Pharo.
On Tue, 5 May 2020 at 21:50, Trygve Reenskaug <a class="moz-txt-link-rfc2396E" href="mailto:trygver@ifi.uio.no"><trygver@ifi.uio.no></a> wrote:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">
Richard,
Thank you for looking at the code. It is comforting to learn that the code has been executed for a large number of examples without breaking. The code is not primarily written for execution but for being read and checked by the human end user. It would be nice if we could also check that it gave the right answers, but I don't know how to do that.
The first question is: Can a human domain expert read the code and sign their name for its correctness?
When this is achieved, a programming expert will transcribe the first code to a professional quality program. This time, the second code should be reviewed by an independent programmer who signs their name for its correct transcription from the first version.
--Trygve
PS: In his 1991 Turing Award Lecture, Tony Hoare said: "There are two ways of constructing a software design: One way is to make it so simple that there are obviously no deficiencies and the other is to make it so complicated that there are no obvious deficiencies. The first method is far more difficult."
--Trygve
On tirsdag.05.05.2020 04:41, Richard O'Keefe wrote:
As a coding experiment, I adapted Trygve Reenskoug's code to my
Smalltalk compiler, put in my code slightly tweaked, and benchmarked
them on randomly generated data.
Result: a factor of 6.3.
In Squeak it was a factor of ten.
I had not, in all honesty, expected it to to be so high.
On Tue, 5 May 2020 at 02:00, Trygve Reenskaug <a class="moz-txt-link-rfc2396E" href="mailto:trygver@ifi.uio.no"><trygver@ifi.uio.no></a> wrote:
A coding experiment.
Consider a Scrum development environment. Every programming team has an end user as a member.
The team's task is to code a credit card validity check.
A first goal is that the user representative shall read the code and agree that it is a correct rendering of their code checker:
luhnTest: trialNumber
| s1 odd s2 even charValue reverse |
-----------------------------------------------
" Luhn test according to Rosetta"
"Reverse the order of the digits in the number."
reverse := trialNumber reversed.
"Take the first, third, ... and every other odd digit in the reversed digits and sum them to form the partial sum s1"
s1 := 0.
odd := true.
reverse do:
[:char |
odd
ifTrue: [
s1 := s1 + char digitValue.
].
odd := odd not
].
"Taking the second, fourth ... and every other even digit in the reversed digits:
Multiply each digit by two and sum the digits if the answer is greater than nine to form partial sums for the even digits"
"The subtracting 9 gives the same answer. "
"Sum the partial sums of the even digits to form s2"
s2 := 0.
even := false.
reverse do:
[:char |
even
ifTrue: [
charValue := char digitValue * 2.
charValue > 9 ifTrue: [charValue := charValue - 9].
s2 := s2 + charValue
].
even := even not
].
"If s1 + s2 ends in zero then the original number is in the form of a valid credit card number as verified by the Luhn test."
^(s1 + s2) asString last = $0
---------------------------------
Once this step is completed, the next step will be to make the code right without altering the algorithm (refactoring). The result should be readable and follow the team's conventions.
P.S. code attached.
--
The essence of object orientation is that objects collaborate to achieve a goal.
Trygve Reenskaug mailto: <a class="moz-txt-link-abbreviated" href="mailto:trygver@ifi.uio.no">trygver@ifi.uio.no</a>
Morgedalsvn. 5A <a class="moz-txt-link-freetext" href="http://folk.uio.no/trygver/">http://folk.uio.no/trygver/</a>
N-0378 Oslo <a class="moz-txt-link-freetext" href="http://fullOO.info">http://fullOO.info</a>
Norway Tel: (+47) 468 58 625
</pre>
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<p class="MsoNormal"><i style="mso-bidi-font-style:normal"><span
style="font-size:10.0pt;mso-fareast-font-family:"Times New
Roman";mso-ansi-language:
EN-US" lang="EN-US">The essence of object orientation is
that objects <span class="GramE">collaborate<span
style="mso-spacerun:yes"> </span>to</span> achieve a
goal. </span></i><span
style="font-size:10.0pt;mso-fareast-font-family:"Times
New Roman";
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<span class="SpellE">Trygve</span> <span class="SpellE">Reenskaug</span> </span><span
style="font-size:10.0pt;mso-fareast-font-family:"Times
New Roman""><a href="mailto:%20trygver@ifi.uio.no"><span
style="mso-ansi-language:
EN-US" lang="EN-US">mailto: trygver@ifi.uio.no</span></a></span><span
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New Roman";mso-ansi-language:
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<span class="SpellE">Morgedalsvn</span>.
5A </span><span style="font-size:10.0pt;
mso-fareast-font-family:"Times New Roman""><a
href="http://folk.uio.no/trygver/"><span
style="mso-ansi-language:EN-US" lang="EN-US">http://folk.uio.no/trygver/</span></a></span><span
style="font-size:10.0pt;mso-fareast-font-family:"Times
New Roman";
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N-0378
Oslo </span><span
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New Roman""><a href="http://fullOO.info"><span
style="mso-ansi-language:EN-US" lang="EN-US">http://fullOO.info</span></a></span><span
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New Roman";
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Norway Tel:
(+47) 468 58 625 </span><span
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EN-US" lang="EN-US"><o:p></o:p></span></p>
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