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Get a random item from a JavaScript array [duplicate]
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Math.random() will never be 1, nor should it. The largest index should always be one less than the length, or else you'll get an undefined error.
– Kelly
Sep 16 '13 at 16:06
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How do I remove code duplication between similar const and non-const member functions?
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class X
{
std::vector<Z> vecZ;
public:
const Z& z(size_t index) const
{
// same really-really-really long access
// and checking code as in OP
// ...
return vecZ[index];
}
Z& z(size_t index)
{
// One line. One ugly, ugly line - but ju...
allowDefinition='MachineToApplication' error when publishing from VS2010 (but only after a previous
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Yes... adding rmdir /S /Q "$(ProjectDir)\obj" to the post build section as per the Microsoft Ticket solved the problem!
– Leniel Maccaferri
May 3 '12 at 21:16
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Fastest way to count exact number of rows in a very large table?
...db_partition_stats st
WHERE
object_name(object_id) = 'MyBigtable' AND (index_id < 2)
2 runs, both under 1 second, count = 1,401,659,670
The second one has less rows = wrong. Would be the same or more depending on writes (deletes are done out of hours here)
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iOS (iPhone, iPad, iPodTouch) view real-time console log terminal
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The solution documented by Apple in Technical Q&A QA1747 Debugging Deployed iOS Apps for Xcode 6 is:
Choose Window -> Devices from the Xcode menu.
Choose the device in the left column.
Click the up-triangle at the bottom left of the right hand panel to show the ...
Convert Array to Object
...se an accumulator aka reduce.
['a','b','c'].reduce(function(result, item, index, array) {
result[index] = item; //a, b, c
return result;
}, {}) //watch out the empty {}, which is passed as "result"
Pass an empty object {} as a starting point; then "augment" that object incrementally.
At the e...
Oracle find a constraint
...l constraints an explicit name. For instance, if the database creates an index for the primary key (which it will do if that column is not already indexed) it will use the constraint name oo name the index. You don't want a database full of indexes named like SYS_C00935191.
To be honest most p...
Filtering a data frame by values in a column [duplicate]
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The subset command is not necessary. Just use data frame indexing
studentdata[studentdata$Drink == 'water',]
Read the warning from ?subset
This is a convenience function intended for use interactively. For
programming it is better to use the standard subsetting functions ...
向CListView控件发LVN_COLUMNCLICK消息 - C/C++ - 清泛网 - 专注C/C++及内核技术
...让控件自己处理：
BOOL ClickListColumn(CListCtrl& listCtrl, int index)
{
if(index >= listCtrl.GetHeaderCtrl()->GetItemCount())
return FALSE;
NM_LISTVIEW nmListView;
memset(&nmListView, 0, sizeof(nmListView));
nmListView.iItem = -1;//NOT U...
怎样禁止访问网站目录下.svn文件夹？ - 更多技术 - 清泛网 - 专注C/C++及内核技术
....svn文件夹？.htaccess中添加如下规则（url包含.svn就定向到index.html）：RewriteEngine OnRewriteBase RewriteCond %{REQUEST_URI} ^(.*( .svn)+.*)$ RewriteRule (.*) index.html.htaccess中添加如下规则（url包含.svn就定向到index.html）：
RewriteEngine On
RewriteBase /...