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Groups > comp.lang.java.programmer > #7816
| From | Wanja Gayk <brixomatic@yahoo.com> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: Style Police (a rant) |
| Date | 2011-09-11 21:20 +0200 |
| Organization | Netfront http://www.netfront.net/ |
| Message-ID | <MPG.28d727a0ecb36f769896b4@202.177.16.121> (permalink) |
| References | (1 earlier) <j3akb0$61g$1@news.albasani.net> <MPG.28d509bfb828d36d9896ad@202.177.16.121> <slrnj6mj4j.6gl.avl@gamma.logic.tuwien.ac.at> <d056de37-3406-4ea1-950e-cd762fa35b6b@glegroupsg2000goo.googlegroups.com> <slrnj6pg53.6gl.avl@gamma.logic.tuwien.ac.at> |
In article <slrnj6pg53.6gl.avl@gamma.logic.tuwien.ac.at>,
avl@gamma.logic.tuwien.ac.at says...
> > Wanja's main point is that 'final' has a semantic purpose, not an
> > optimization one.
>
> So far I agree.
Well understood.
> > I agree that the evidence for the advantage of a 'var' keyword
> > over a 'final' is lacking,
>
> That Wanja suggested the "var" keyword is an indication of that he has
> a bias towards functional programming.
Hm, I can't really say that this is the case. It's just in the past few
years that I'm adopting rather functional paradigms, which in Java
mostly boils down to using the strategy pattern and a preference towards
methods that are free of side-effects.
But using "finally" a lot has hardly anything to do with functional
programming in my opinion.
I'm doing it for the sake of precision of expression (don't declare
something variable if it's not) and staying focussed. Anything that is
not "final" immediately draws my attention for being a subject of
change, which means I can forget about most of the variables when
analyzing code. This is also why I narrow the scope of variables a lot.
Here's an example:
I have seen code that looks like this:
//O(n*n) runtime, but "in place", suitable only if
//memory is far more important than runtime.
//
//[][1,2,3,4,3,2,1] head contains 1 ? -> false
//[1][2,3,4,3,2,1] head contains 2 ? -> false
//[1,2][3,4,3,2,1] head contains 3 ? -> false
//[1,2,3][4,3,2,1] head contains 4 ? -> false
//[1,2,3,4][3,2,1] head contains 3 ? -> true
//[1,2,3,4][2,1] head contains 2 ? -> true
//[1,2,3,4][1] head contains 1 ? -> true
//[1,2,3,4][]
public <T> void withoutDupes(Iterable<T> iterable) {
Iterator<T> tail = iterable.iterator();
int tailIndex = -1;
int headIndex = 0;
Iterator<T> head = null;
T head ofTail = null;
T objectInHead = null;
while (tail.hasNext()) {
tailIndex++;
headOfTail = tail.next();
headIndex = 0;
head = iterable.iterator();
while (headIndex++ < tailIndex) {
objectInHead = head.next();
if (matches(headOfTail, objectInHead)) {
tail.remove();
tailIndex = tailIndex-1;
break;
}
}
}
}
I find this unnecessary hard to follow, because I have a hard time to
see which value changes when and where a value is needed.
I first start to reduce the scope of the variables, which also kills
unnecessary initializations:
public <T> void withoutDupes(Iterable<T> iterable) {
Iterator<T> tail = iterable.iterator();
int tailIndex = -1;
while (tail.hasNext()) {
tailIndex++;
T headOfTail = tail.next();
int headIndex = 0;
Iterator<T> head = iterable.iterator();
while (headIndex++ < tailIndex) {
T objectInHead = head.next();
if (matches(headOfTail, objectInHead)) {
tail.remove();
tailIndex = tailIndex-1;
break;
}
}
}
}
Then I would add the "finally"-keyword to any place appropriate, Ecipses
source-"clean up" function does that for me, so it's just three or four
few mouseclicks/keystrokes away:
public <T> void withoutDupes(final Iterable<T> iterable) {
final Iterator<T> tail = iterable.iterator();
int tailIndex = -1;
while (tail.hasNext()) {
tailIndex++;
final T headOfTail = tail.next();
int headIndex = 0;
final Iterator<T> head = iterable.iterator();
while (headIndex++ < tailIndex) {
final T objectInHead = head.next();
if (matches(headOfTail, objectInHead)) {
tail.remove();
tailIndex = tailIndex-1;
break;
}
}
}
}
At this point I find the code a lot easier to follow, because I have
less variables to trace and their scope is limited. It looks even better
in the IDE, because of the syntax highlighting.
The variables "tailIndex" and "headIndex" immediately catch my
attention, they are not preceeded with "finally" so those are the
running variables and as such the most interesting when tracng the code.
Still that would not satisfy me. As a final touch I'd change the
increments where appropriate to clarify the order of evaluation, because
"if(i++ < 10){...}"
is short for
"int temp = i; i=i+1; if(temp < 10){..}"
which is unnecessarily complicated.
So as I would end up with:
public <T> void withoutDupes(final Iterable<T> iterable) {
Iterator<T> tail = iterable.iterator();
int tailIndex = -1;
while (tail.hasNext()) {
++tailIndex;
T headOfTail = tail.next();
int headIndex = -1;
Iterator<T> head = iterable.iterator();
while (++headIndex < tailIndex) {
T objectInHead = head.next();
if (matches(headOfTail, objectInHead)) {
tail.remove();
--tailIndex;
break;
}
}
}
}
Now this is a code I find a lot easier to understand than the first
version, that looked like this:
public <T> void withoutDupes(Iterable<T> iterable) {
Iterator<T> tail = iterable.iterator();
int tailIndex = -1;
int headIndex = 0;
Iterator<T> head = null;
T head ofTail = null;
T objectInHead = null;
while (tail.hasNext()) {
tailIndex++;
headOfTail = tail.next();
headIndex = 0;
head = iterable.iterator();
while (headIndex++ < tailIndex) {
objectInHead = head.next();
if (matches(headOfTail, objectInHead)) {
tail.remove();
tailIndex = tailIndex-1;
break;
}
}
}
}
Still I could refactor out one or two methods, but at this time I would
probably stop and call it a day.
> Unlike Arne, I don't say that
> "pick a different language" is an appropriate answer. It's ok, to program
> functionally in Java, as far as possible in Java-syntax, and that this
> may lead to quite a lot of "final"s.
> I just disagree with Wanja as to making "final" the default: it's
> like bullying others to functional style in Java.
The above code is by no means functional, is it?
Functional code would rather look like this:
public <T> List<T> withoutDupes(final List<T> xs) {
return new Object() {
<T> List<T> withoutDupes(final List<T> head, final List<T> tail) {
if(tail.isEmpty()){return head;}
if (head.contains(tail.get(0))) {
return withoutDupes(head, tail.subList(1, tail.size()));
}
return withoutDupes(
new ArrayList<T>(head){{add(tail.get(0));}}
, tail.subList(1, tail.size())
);
}
}.withoutDupes(Collections.<T>emptyList(), xs);
}
This is a whole different beast (and prone to crash with a stack
overflow exception on larger lists by the way).
Admitted, it is not entirely functional due to the "add"-call, but quite
close. Still it is pretty compact code (there is a certain beauty in
recursion, isn't it?) and not hard to understand either.
Bullying someone to functional code would be pretty stupid, as the
current JVMs still have a hard time detecting tail recursions and it
lacks data structures that do lazy evaluation in the Java SE.
Kind regards,
Wanja
--
..Alesi's problem was that the back of the car was jumping up and down
dangerously - and I can assure you from having been teammate to
Jean Alesi and knowing what kind of cars that he can pull up with,
when Jean Alesi says that a car is dangerous - it is. [Jonathan Palmer]
--- Posted via news://freenews.netfront.net/ - Complaints to news@netfront.net ---
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Re: Style Police (a rant) Lew <lewbloch@gmail.com> - 2011-09-11 20:36 -0700
Re: Style Police (a rant) Lars Enderin <lars.enderin@telia.com> - 2011-09-12 10:05 +0200
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Re: Style Police (a rant) "Cthun" <cthun_117@qmail.net.au> - 2011-09-12 06:42 -0400
Re: Style Police (a rant) Cthun <cthun_117@qmail.net.au> - 2011-09-12 07:20 -0400
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Re: Style Police (a rant) Tom Anderson <twic@urchin.earth.li> - 2011-09-12 20:18 +0100
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Re: Style Police (a rant) Lew <lewbloch@gmail.com> - 2011-09-11 13:52 -0700
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Re: Style Police (a rant) Arne Vajhøj <arne@vajhoej.dk> - 2011-09-11 11:05 -0400
Re: Style Police (a rant) Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-09-11 13:23 +0000
Re: Style Police (a rant) Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-09-11 10:04 -0400
Re: Style Police (a rant) Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-09-11 12:45 -0300
Re: Style Police (a rant) Arne Vajhøj <arne@vajhoej.dk> - 2011-09-11 16:53 -0400
Re: Style Police (a rant) Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-09-14 12:30 +0000
Re: Style Police (a rant) Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-09-14 20:47 -0400
Re: Style Police (a rant) Lew <lewbloch@gmail.com> - 2011-09-14 18:06 -0700
Re: Style Police (a rant) Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-09-15 10:06 +0000
Re: Style Police (a rant) blmblm@myrealbox.com <blmblm.myrealbox@gmail.com> - 2011-09-20 11:28 +0000
Re: Style Police (a rant) Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-09-20 07:36 -0400
Re: Style Police (a rant) Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-09-20 13:04 +0000
Re: Style Police (a rant) Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-09-20 20:34 -0300
Re: Style Police (a rant) Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-09-14 22:33 -0300
Re: Style Police (a rant) Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-09-15 13:46 +0000
Re: Style Police (a rant) Arne Vajhøj <arne@vajhoej.dk> - 2011-09-14 21:40 -0400
Re: Style Police (a rant) Arne Vajhøj <arne@vajhoej.dk> - 2011-09-11 10:59 -0400
Re: Style Police (a rant) Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-09-11 21:25 +0000
Re: Style Police (a rant) Tom Anderson <twic@urchin.earth.li> - 2011-08-27 14:00 +0100
Re: Style Police (a rant) Lew <lewbloch@gmail.com> - 2011-08-27 08:42 -0700
Re: Style Police (a rant) Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-08-27 11:58 -0400
Re: Style Police (a rant) "John B. Matthews" <nospam@nospam.invalid> - 2011-08-28 08:21 -0400
Re: Style Police (a rant) Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2011-08-28 18:07 -0300
Re: Style Police (a rant) Roedy Green <see_website@mindprod.com.invalid> - 2011-08-29 04:20 -0700
Re: Style Police (a rant) Tim Slattery <Slattery_T@bls.gov> - 2011-08-29 09:11 -0400
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Re: Style Police (a rant) Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-08-30 11:27 +0000
Re: Style Police (a rant) Lew <lewbloch@gmail.com> - 2011-08-30 09:36 -0700
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Re: Style Police (a rant) Tim Slattery <Slattery_T@bls.gov> - 2011-08-30 08:51 -0400
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csiph-web