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@property retain, assign, copy, nonatomic in Objective-C
...read locks. The only reason to use atomic is if your property might be set from multiple threads (in which case omitting it can lead to an over-release or a leak).
– Adam Kaplan
Jun 26 '15 at 20:35
...
git + LaTeX workflow
...changes have been made to each chapter, instead of having to figure it out from the logs of one big file.
Using Git efficiently:
Use branches!. There is perhaps no better advice I can give. I've found branches to be very helpful to keep track of "different ideas" for the text or for "different st...
Check if checkbox is checked with jQuery
...="chk[]" id="chk[]" value="Bananas" />
Instead, drop the ID, and then select them by name, or by a containing element:
<fieldset id="checkArray">
<input type="checkbox" name="chk[]" value="Apples" />
<input type="checkbox" name="chk[]" value="Bananas" />
</fieldse...
How to make Twitter bootstrap modal full screen
...adding issues, try right+clicking (or cmd+clicking on mac) the element and select "inspect element" on Chrome or "inspect element with firebug" on Firefox. Try selecting different HTML elements in the "elements" panel and editing the CSS on the right in real-time until you get the padding / spacing...
jQuery Validate Plugin - How to create a simple custom rule?
...ame="' + element.name + '"]:checked').length > 0;
}, "Atleast 1 must be selected");
And you can also override the message of a rule (ie: Atleast 1 must be selected) by using the syntax data-msg-rulename="my new message".
NOTE
If you use the data-rule-rulename method then you will need to mak...
Local file access with JavaScript
...
If the user selects a file via <input type="file">, you can read and process that file using the File API.
Reading or writing arbitrary files is not allowed by design. It's a violation of the sandbox. From Wikipedia -> Javascri...
MongoDB仿关系型数据库Group聚合例子 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...系型数据库例子，通过BsonJavaScript脚本实现。相当的SQL：select * from GroupDemo a right join (select userName,max(date) maxdate from GroupDemo group by userName) b on a date=b maxdate
namespace MongoGroupDemo
{
class Program
{
private static string MongoConnStr...
Linq 多字段排序，二次排序 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ed = source.OrderByDescending( t => t.f1 ).ThenBy( t => t.f2 );类似SQL：select * from t1 order by f1 d...Linq：ordered = source.OrderByDescending( t => t.f1 ).ThenBy( t => t.f2 );
类似SQL：select * from t1 order by f1 desc ,f2 asc
这种写法里 OrderBy、ThenBy 是升序的，OrderByD...
How to show google.com in an iframe?
...t('script');
script.src = 'https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20data.headers%20where%20url%3D%22' + encodeURIComponent(url) + '%22&format=json&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&callback=getData';
document.body.app...
How to query as GROUP BY in django?
...nnotate(dcount=Count('designation'))
This results in a query similar to
SELECT designation, COUNT(designation) AS dcount
FROM members GROUP BY designation
and the output would be of the form
[{'designation': 'Salesman', 'dcount': 2},
{'designation': 'Manager', 'dcount': 2}]
...