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Weak and strong property setter attributes in Objective-C
...
Here is information what I know about variable properties
atomic //default
nonatomic
strong=retain //default
weak
retain
assign //default
unsafe_unretained
copy
readonly
readwrite //default
so ...
When should I use a List vs a LinkedList
...lower!! I say never use a linkedList.
Here is another comparison performing a lot of inserts (we plan on inserting an item at the middle of the list)
Linked List (51 seconds)
LinkedList<Temp> list = new LinkedList<Temp>();
for (var i = 0; i < 123456; i++)
...
Can scrapy be used to scrape dynamic content from websites that are using AJAX?
...enu->Tools->Developer Tools. The Network tab allows you to see all information about every request and response:
In the bottom of the picture you can see that I've filtered request down to XHR - these are requests made by javascript code.
Tip: log is cleared every time you load a page, at ...
John Carmack's Unusual Fast Inverse Square Root (Quake III)
...s, can be represented by a polynomial sum:
y = f(x)
can be exactly transformed into:
y = a0 + a1*x + a2*(x^2) + a3*(x^3) + a4*(x^4) + ...
Where a0, a1, a2,... are constants. The problem is that for many functions, like square root, for exact value this sum has infinite number of members, it do...
Difference between Observer, Pub/Sub, and Data Binding
...ers. In .NET, one can use the standard events for this, since events are a form of MulticastDelegate, and so can support delivery of events to multiple subscribers, and also support unsubscription. Pub/Sub has a slightly different meaning in certain contexts, usually involving more "anonymity" betwe...
How to add a custom Ribbon tab using VBA?
... quesiton with you basic xml code and the VBA code and then we can take it form there? @YasserKhalil
– Siddharth Rout
Apr 9 at 16:27
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How do RVM and rbenv actually work?
...xchange.using('gps', function() { StackExchange.gps.track('embedded_signup_form.view', { location: 'question_page' }); });
$window.unbind('scroll', onScroll);
}
};
...
Line-breaking widget layout for Android
...e divided into 'words', each being a widget, and sequence of 'words' would form the data ('sentence'?), the ViewGroup widget containing the words. As space required for all 'words' in a 'sentence' would exceed the available horizontal space on the display, I would like to wrap these 'sentences' as y...
dplyr summarise: Equivalent of “.drop=FALSE” to keep groups with zero length in output
...the same result using xtabs, for example:
using dplyr:
df %>%
xtabs(formula = ~ b) %>%
as.data.frame()
or shorter:
as.data.frame(xtabs( ~ b, df))
result (equal in both cases):
b Freq
1 1 6
2 2 6
3 3 0
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Why not use exceptions as regular flow of control?
...ere are other strong reasons not to use exceptions too much, especially performance-wise
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