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Use of .apply() with 'new' operator. Is this possible?
...ECMAScript5's Function.prototype.bind things get pretty clean:
function newCall(Cls) {
return new (Function.prototype.bind.apply(Cls, arguments));
// or even
// return new (Cls.bind.apply(Cls, arguments));
// if you know that Cls.bind has not been overwritten
}
It can be used as fol...
What's the fastest way to do a bulk insert into Postgres?
...
PostgreSQL has a guide on how to best populate a database initially, and they suggest using the COPY command for bulk loading rows. The guide has some other good tips on how to speed up the process, like removing indexes and foreign keys befor...
Difference between new and override
...use the last defined
implementation of a method. Even if
the method is called on a reference to
the base class it will use the
implementation overriding it.
public class Base
{
public virtual void DoIt()
{
}
}
public class Derived : Base
{
public override void DoIt()
{...
How can I run a function from a script in command line?
...context of the current shell using the source or . command and then simply call the function. See help source for more information.
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What is the difference between a function expression vs declaration in JavaScript? [duplicate]
...
They're actually really similar. How you call them is exactly the same.The difference lies in how the browser loads them into the execution context.
Function declarations load before any code is executed.
Function expressions load only when the interpreter reaches...
What order are the Junit @Before/@After called?
... I've been doing is just overriding those two methods in each testcase and calling super.setUp() and super.tearDown() . However this can cause problems if someone forgets to call the super or puts them at the wrong place and an exception is thrown and they forget to call super in the finally or s...
Android Drawing Separator/Divider Line in Layout?
I would like to draw a line right in the middle of a layout and use it as a separator of other items like TextView. Is there a good widget for this. I don't really want to use an image as it would be hard to match the other components to it. And I want it to be relatively positioned as well. Than...
Python exit commands - why so many and when should each be used?
... the sys module will always be there.
os._exit() exits the program without calling cleanup handlers, flushing stdio buffers, etc. Thus, it is not a standard way to exit and should only be used in special cases. The most common of these is in the child process(es) created by os.fork.
Note that, of...
What is the main difference between Inheritance and Polymorphism?
...xtends Person, which has its own implementation of read, which method gets called is determined for you by the runtime, depending if you have a Person or a Student. It gets a bit tricky, but if you do something like
Person p = new Student();
p.read();
the read method on Student gets called. Tha...
How can I debug a .BAT script?
...to step through a .bat script? The thing is, I have a build script , which calls a lot of other scripts, and I would like to see what is the order in which they are called, so that I may know where exactly I have to go about and add my modifications.
...