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Why does the MongoDB Java driver use a random number generator in a conditional?
...een new 'questions' would show up, and they would show up in a batch, like 100 of them in a row.
The programmer was happy with how the program was working, but he wanted some way of maybe improving the software in the future, if possible new questions were discovered.
So, the solution was to log u...
mongoDB/mongoose: unique if not null
...
As of MongoDB v1.8+ you can get the desired behavior of ensuring unique values but allowing multiple docs without the field by setting the sparse option to true when defining the index. As in:
email : {type: String, trim: true, index: tr...
is_file or file_exists in PHP
...enchmark('is_readable');
function benchmark($funcName) {
$numCycles = 10000;
$time_start = microtime(true);
for ($i = 0; $i < $numCycles; $i++) {
clearstatcache();
$funcName('path/to/file.php'); // or 'path/to/file.php' instead of __FILE__
}
$time_end = microt...
How to calculate the SVG Path for an arc (of a circle)
...e
document.getElementById("arc1").setAttribute("d", describeArc(200, 400, 100, 0, 180));
and in your html
<path id="arc1" fill="none" stroke="#446688" stroke-width="20" />
Live demo
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通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...shell 终端进程，只在其中一个环境中执行了 ulimit – s 100，则该 shell 进程里创建文件的大小收到相应的限制，而同时另一个 shell 终端包括其上运行的子程序都不会受其影响：
Shell 进程 1
ulimit – s 100
cat testFile > newFi...
What is cURL in PHP?
... Dload Upload Total Spent Left Speed
100 492k 100 492k 0 0 1077k 0 --:--:-- --:--:-- --:--:-- 1240k
Then you can open up your gif in firefox:
firefox mycat.gif
Glorious cats evolving Toxoplasma gondii to cause women to keep cats around and m...
What does if __name__ == “__main__”: do?
...re functionB")
def functionB():
print("Function B {}".format(math.sqrt(100)))
print("before __name__ guard")
if __name__ == '__main__':
functionA()
functionB()
print("after __name__ guard")
Special Variables
When the Python interpreter reads a source file, it first defines a few specia...
RESTful web service - how to authenticate requests from other services?
...
+100
Any solution to this problem boils down to a shared secret. I also don't like the hard-coded user-name and password option but it do...
Cost of len() function
... and is not timed.
List:
$ python -m timeit -s "l = range(10);" "len(l)"
10000000 loops, best of 3: 0.0677 usec per loop
$ python -m timeit -s "l = range(1000000);" "len(l)"
10000000 loops, best of 3: 0.0688 usec per loop
Tuple:
$ python -m timeit -s "t = (1,)*10;" "len(t)"
10000000 loops, bes...
How to implement a ConfigurationSection with a ConfigurationElementCollection
...
+100
If you are looking for a custom configuration section like following
<CustomApplicationConfig>
<Credentials Usern...