Re: [PHP-DEV] Re: [PHP-WEBMASTER] New wiki account
On Sat, May 12, 2012 at 12:22 AM, Alexander Moskaliov ir...@irker.net wrote:
2012/5/12 Dmitri Ravazin rava...@gmail.com
Yes... That's just what I had in the RFC.
Not at all. In RFC you use first expression in for ... else statement as
condition for else statement.
if (some_very_expensive_and_ugly_looking_calculation($array) 0) {
}
I think it correct to use the second expression before the start of
looping, as I described in previous mail.
That if is testing the inverse condition of $exp2 from for, so it
will yield exactly the same result.
If some_very_expensive_and_ugly_looking_calculation($array) is less
than 0, then it can't be greater of equal than 0 at the same time, so
for loop will not be entered.
It is assumed, of course, that the function does not modify the data.
If it did, then yeah, we'd need a temporary variable.
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[PHP-DEV] Re: [PHP-WEBMASTER] New wiki account
I think the main idea of this RFC: Run the code, if we had never entered
in loop.
In this case more sence to change for .. else condition to this:
If second expression is equal FALSE before looping(but after run first
expression of course), we run else code.
By example:
for (exp1;exp2;exp3) {
exp4;
} else {
exp5;
}
must be equal
$notLooping = true;
for (exp1;exp2;exp3) {
exp4;
$notLooping = false;
}
if ($notLooping) {
exp5;
}
With regards, Alexander Moskaliov
ir...@irker.net
2012/5/10 Dmitri Ravazin rava...@gmail.com
Hi,
I registered account 'ravazin' on wiki.
I'd like to write an RFC based on bugs:
https://bugs.php.net/bug.php?id=26411
https://bugs.php.net/bug.php?id=46240
https://bugs.php.net/bug.php?id=61222
I think it's time these requests got some sort of resolution :)
Re: [PHP-DEV] Re: [PHP-WEBMASTER] New wiki account
On Fri, May 11, 2012 at 8:33 AM, Alexander Moskaliov ir...@irker.net wrote:
I think the main idea of this RFC: Run the code, if we had never entered
in loop.
In this case more sence to change for .. else condition to this:
If second expression is equal FALSE before looping(but after run first
expression of course), we run else code.
By example:
for (exp1;exp2;exp3) {
exp4;
} else {
exp5;
}
Python already uses the for .. else syntax, but with different
semantics: In Python the else clause is only executed, if the loop
isn't left using break. See this article for more info:
http://psung.blogspot.de/2007/12/for-else-in-python.html
Thus I'm not sure that it really makes sense for us to introduce this
syntax with a completely different meaning.
Nikita
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[PHP-DEV] Re: [PHP-WEBMASTER] New wiki account
On Fri, May 11, 2012 at 2:33 AM, Alexander Moskaliov ir...@irker.net wrote:
I think the main idea of this RFC: Run the code, if we had never entered
in loop.
In this case more sence to change for .. else condition to this:
If second expression is equal FALSE before looping(but after run first
expression of course), we run else code.
By example:
for (exp1;exp2;exp3) {
exp4;
} else {
exp5;
}
must be equal
$notLooping = true;
for (exp1;exp2;exp3) {
exp4;
$notLooping = false;
}
if ($notLooping) {
exp5;
}
Yes... That's just what I had in the RFC.
Except I used the name $loop_entered, and then checked for it being
false, and you used variable $notLooping, and checked for it being
true.
That is the same thing.
Hey, I noticed you CC'ed internals, does that mean everyone on the
list is getting this?
Sorry, not entirely familiar with how these mailing lists work.
On Fri, May 11, 2012 at 6:21 AM, Nikita Popov nikita@googlemail.com wrote:
Python already uses the for .. else syntax, but with different
semantics: In Python the else clause is only executed, if the loop
isn't left using break. See this article for more info:
http://psung.blogspot.de/2007/12/for-else-in-python.html
Thus I'm not sure that it really makes sense for us to introduce this
syntax with a completely different meaning.
Nikita
Python isn't always right in how it does things.
I find python for...else logic to have fewer real-life use-cases than
what is being proposed here.
I'm speaking from my experience, of course, and not saying it's true
for every project out there... But if the comments to those bugs are
any indication, it is true for most people.
You will notice that all 3 proposals (spanning almost 10 years)
advocate the non-python logic.
And even if you look at the example from your article, it does *not*
demonstrate usefulness of for...else in python.
I can write the same code without for...else and without any flag
variables by just returning from the function, instead of breaking:
def contains_even_number(l):
Prints whether or not the list l contains an even number.
for elt in l:
if elt % 2 == 0:
print list contains an even number
return
print list does not contain an even number
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Re: [PHP-DEV] Re: [PHP-WEBMASTER] New wiki account
Hey, I noticed you CC'ed internals, does that mean everyone on the list is getting this? Sorry, not entirely familiar with how these mailing lists work. Yep. And at least for my part, I have no idea what RFC you guys are talking about lol. ;P --Kris
Re: [PHP-DEV] Re: [PHP-WEBMASTER] New wiki account
2012/5/12 Dmitri Ravazin rava...@gmail.com
Yes... That's just what I had in the RFC.
Not at all. In RFC you use first expression in for ... else statement as
condition for else statement.
if (some_very_expensive_and_ugly_looking_calculation($array) 0) {
}
I think it correct to use the second expression before the start of
looping, as I described in previous mail.
2012/5/12 Kris Craig kris.cr...@gmail.com
Yep. And at least for my part, I have no idea what RFC you guys are
talking about lol. ;P
Sorry, RFC link was in old thread: https://wiki.php.net/rfc/loop_else
With regards, Alexander Moskaliov
ir...@irker.net
