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Is List a subclass of List? Why are Java generics not implicitly polymorphic?
...w type parameters to be specified as covariant, which avoids the ? extends Foo in method declarations, but that does add additional complexity.
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How can you profile a Python script?
...r code, or from the interpreter, like this:
import cProfile
cProfile.run('foo()')
Even more usefully, you can invoke the cProfile when running a script:
python -m cProfile myscript.py
To make it even easier, I made a little batch file called 'profile.bat':
python -m cProfile %1
So all I hav...
Detect changes in the DOM
...erver = new MutationObserver(callback)
// have the observer observe foo for changes in children
mutationObserver.observe( obj, { childList:true, subtree:true })
return mutationObserver
}
// browser support fallback
else if( window.addEventListener ){
obj.add...
Understanding keystore, certificates and alias
...n only release an update to an application that was signed with the alias 'foo' by signing the update again with the same alias. Losing the keystore where your alias is stored would prevent you from releasing an updated version of your app.
There is however a way to sign an app with a new alias, bu...
Escape single quote character for use in an SQLite query
...A's value could be null or contain hyphens.:
sqlite3 $db_name "insert into foo values (\"$columnA\", $columnB)";
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How to verify that method was NOT called in Moq?
...m = new Mock<ISomething>();
m.Expect(x => x.Forbidden()).Returns("foo").AtMost(0);
Although the "throws" also works, AtMost(0) is more expressive IMHO.
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How to catch integer(0)?
...hat class of object and combine it with an element of that class:
attr(a,"foo")<-"bar"
> identical(1L,c(a,1L))
[1] TRUE
Or more generally:
is.empty <- function(x, mode=NULL){
if (is.null(mode)) mode <- class(x)
identical(vector(mode,1),c(x,vector(class(x),1)))
}
b <- num...
How do you disable browser Autocomplete on web form field / input tag?
...orm data from being cached in older browsers.
<input type="text" name="foo" autocomplete="off" />
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Using the “final” modifier whenever applicable in Java [closed]
...Exception:
final FileInputStream in;
if(test)
in = new FileInputStream("foo.txt");
else
System.out.println("test failed");
in.read(); // Compiler error because variable 'in' might be unassigned
By preventing a variable from being assigned more than once, you discourage overbroad scoping. Inst...
Retrieve version from maven pom.xml in code
...ur .properties file using the standard Maven property for project version:
foo.bar=${project.version}
In your Java code, load the value from the properties file as a resource from the classpath (google for copious examples of how to do this, but here's an example for starters).
In Maven, enable r...