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Does Python have a string 'contains' substring method?
...class NoisyString(str):
def __contains__(self, other):
print(f'testing if "{other}" in "{self}"')
return super(NoisyString, self).__contains__(other)
ns = NoisyString('a string with a substring inside')
and now:
>>> 'substring' in ns
testing if "substring" in "a string...
When should I use a table variable vs temporary table in sql server?
...e some suggestions are below (though the most reliable method is to simply test both with your specific workload).
If you need an index that cannot be created on a table variable then you will of course need a #temporary table. The details of this are version dependant however. For SQL Server 2012...
What is 'Pattern Matching' in functional languages?
...))));
Pattern matching in a nutshell
Pattern matching is a kind of type-testing. So let's say we created a stack object like the one above, we can implement methods to peek and pop the stack as follows:
let peek s =
match s with
| Cons(hd, tl) -> hd
| Nil -> failwith "Empty sta...
How to validate an email address in PHP
...ave false positives is something no mortal can do. Check out this list for tests (both failed and succeeded) of the regex used by PHP's filter_var() function.
Even the built-in PHP functions, email clients or servers don't get it right. Still in most cases filter_var is the best option.
If you wa...
Error java.lang.OutOfMemoryError: GC overhead limit exceeded
I get this error message as I execute my JUnit tests:
20 Answers
20
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How do I find the caller of a method using stacktrace or reflection?
...and seems to be faster than the stack trace method.
The following program tests the speed of the different suggested methods (the most interesting bit is in the inner class SecurityManagerMethod):
/**
* Test the speed of various methods for getting the caller class name
*/
public class TestGetCa...
Android - Start service on boot
...d("TAG", "MyReceiver");
Intent serviceIntent = new Intent(context, Test1Service.class);
context.startService(serviceIntent);
}
}
public class Test1Service extends Service {
/** Called when the activity is first created. */
@Override
public void onCreate() {
...
Delete all files in directory (but not directory) - one liner solution
...iles from ABC (sub-directories are untouched):
Arrays.stream(new File("C:/test/ABC/").listFiles()).forEach(File::delete);
This deletes only files from ABC (and sub-directories):
Files.walk(Paths.get("C:/test/ABC/"))
.filter(Files::isRegularFile)
.map(Path::toFil...
Static Initialization Blocks
...o matter how many objects of that type you create.
Example:
public class Test {
static{
System.out.println("Static");
}
{
System.out.println("Non-static block");
}
public static void main(String[] args) {
Test t = new Test();
Test t2 = new Tes...
Bash: If/Else statement in one line
... to explicitly check $?. Just do:
ps aux | grep some_proces[s] > /tmp/test.txt && echo 1 || echo 0
Note that this relies on echo not failing, which is certainly not guaranteed. A more reliable way to write this is:
if ps aux | grep some_proces[s] > /tmp/test.txt; then echo 1; el...