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Is double square brackets [[ ]] preferable over single square brackets [ ] in Bash?
..., I heard ksh supports it too). For example, you can do
[[ -e $b ]]
to test whether a file exists. But with [, you have to quote $b, because it splits the argument and expands things like "a*" (where [[ takes it literally). That has also to do with how [ can be an external program and receives i...
Error Dropping Database (Can't rmdir '.test\', errno: 17)
...next process was to display the default databases (info. schema, mysql and test) which was achieved by using "SHOW DATABASES;"
...
static constructors in C++? I need to initialize private static objects
...
Test::StaticTest() is called exactly once during global static initialization.
Caller only has to add one line to the function that is to be their static constructor.
static_constructor<&Test::StaticTest>::c; forc...
How to call a shell script from python code?
...ple:
>>> import subprocess
>>> subprocess.call(['sh', './test.sh']) # Thanks @Jim Dennis for suggesting the []
0
>>>
Where test.sh is a simple shell script and 0 is its return value for this run.
...
Generate a Hash from string in Javascript
...
I did a few tests on jsperf (jsperf.com/hashing-strings) and the bitwise function is actually more slow than the number based function.
– skerit
Jun 29 '12 at 21:23
...
ExpressJS How to structure an application?
....js application.
focusaurus/express_code_structure is the repo with the latest code for this. Pull requests welcome.
Here's a snapshot of the README since stackoverflow doesn't like just-a-link answers. I'll make some updates as this is a new project that I'll continue updating, but ultimately the...
remove_if equivalent for std::map
...e_if(container, []( item_type& item ) {
return /* insert appropriate test */;
});
Second example (allows you to pass in a test value):
// 'test_value' is value that you might inject into your predicate.
// 'property' is just used to provide a stand-in test
using stuff::erase_if;
int test_va...
Changing CSS Values with Javascript
...tylesheets on the page. The following script works with IE5.5 as well as latest Google Chrome, and adds only the above described css() function.
(function (scope) {
// Create a new stylesheet in the bottom
// of <head>, where the css rules will go
var style = document.createElemen...
Maven: how to do parallel builds?
...are great, but I wanted to add something to the answers here regarding the test stability during parallel builds.
So, when Maven parallel build is used:
mvn -T 4 clean install # Builds with 4 threads
mvn -T 1C clean install # 1 thread per cpu core
mvn -T 1.5C clean install # 1.5 thread per cpu core
...
Python: Checking if a 'Dictionary' is empty doesn't seem to work
...er using the first way only though. The other two ways are way too wordy.
test_dict = {}
if not test_dict:
print "Dict is Empty"
if not bool(test_dict):
print "Dict is Empty"
if len(test_dict) == 0:
print "Dict is Empty"
...