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Why does String.valueOf(null) throw a NullPointerException?
...nd applicable to a method invocation, it is necessary to choose one to provide the descriptor for the run-time method dispatch. The Java programming language uses the rule that the most specific method is chosen.
A char[] is-an Object, but not all Object is-a char[]. Therefore, char[] is more spec...
Is it OK to leave a channel open?
...principle of using Go channels is don't close a channel from the receiver side and don't close a channel if the channel has multiple concurrent senders."
As clearly mentioned in answer above that every channel will be GCed eventually once it is marked for cleanup, so it is okay to leave channel un-...
String formatting in Python 3
...ere's also a way of doing it using a single argument twice (as @Burhan Khalid noted in the comments):
"({0.goals} goals, ${0.penalties})".format(self)
Explaining:
{} means just the next positional argument, with default format;
{0} means the argument with index 0, with default format;
{:d} is t...
UITableView set to static cells. Is it possible to hide some of the cells programmatically?
...ttps://github.com/xelvenone/StaticDataTableViewController
which can show/hide/reload any static cell(s) with or without animation!
[self cell:self.outletToMyStaticCell1 setHidden:hide];
[self cell:self.outletToMyStaticCell2 setHidden:hide];
[self reloadDataAnimated:YES];
Note to always use onl...
Convert numpy array to tuple
... Nice generalization. As a python newbie, though, I wonder if it's considered good style to use exceptions for a condition that is almost as common as the non-exceptional state. At least in c++, flow control by exceptions is usually frowned upon. Would it be better to test if type(a)==numpy.nd...
Markdown vs markup - are they related?
... useful: Markdown is a text-to-HTML conversion tool for web writers. In a wider sense, any text-to-HTML conversion tool could be considered supporting "markdown".
– PeterX
Sep 20 '17 at 3:42
...
.gitignore file, where should I put it in my xcode project?
...my XCode4 project, but where should I put the .gitignore file?, is it inside the .git folder? or out? The .git is in same folder with the ProjectName.xcodeproj file
...
What is the in a .vimrc file?
... either hand, making the follow up key (whether it's on the left or right side of the keyboard) equally quick to trigger afterward. Having a leader key that itself is only on one side of the keyboard makes hitting follow up keys on the same side of the keyboard feel slightly more cumbersome. Nitpick...
Overloading member access operators ->, .*
...t;
proxy &operator->() const
{ return * target; }
};
void f() {
client x = { 3 };
proxy y = { & x };
proxy2 z = { & y };
std::cout << x.a << y->a << z->a; // print "333"
}
->*
This one is only tricky in that there is nothing ...
How do you get current active/default Environment profile programmatically in Spring?
...is approach is that it won't get all of the profiles that Spring might consider when evaluating @Profile. Apps can also use the spring.profiles.include property, and can set profiles programmatically during initialization using ConfigurableEnvironment. Environment.getActiveProfiles() will get the ...