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Best way to pretty print a hash
... null", ": nil").
gsub(/(^\s*)"([a-zA-Z][a-zA-Z\d_]*)":/, "\\1\\2:"). # "foo": 1 -> foo: 1
gsub(/(^\s*)(".*?"):/, "\\1\\2 =>") # "123": 1 -> "123" => 1
{
a: 1,
"2" => 3,
"3" => nil
}
share
...
Does a method's signature in Java include its return type?
....
Since the question was edited to include this example:
public class Foo {
public int myMethod(int param) {}
public char myMethod(int param) {}
}
No, the compiler won't know the difference, as their signature: myMethod(int param) is the same. The second line:
public char myMeth...
What is the JavaScript >>> operator and how do you use it?
...ey can be used on array-like objects e.g. Array.prototype.indexOf.call({0:'foo', 1:'bar', length: 2}, 'bar') == 1;. The arguments object is also a good example. For pure array objects, it's impossible to change the type of the length property, because they implement an special [[Put]] internal metho...
What does the caret operator (^) in Python do?
...ns exponentiation. You could do that this way, just as one example:
class Foo(float):
def __xor__(self, other):
return self ** other
Then something like this will work, and now, for instances of Foo only, the ^ symbol will mean exponentiation.
In [16]: x = Foo(3)
In [17]: x
Out[17]:...
What is a StackOverflowError?
...
If you have a function like:
int foo()
{
// more stuff
foo();
}
Then foo() will keep calling itself, getting deeper and deeper, and when the space used to keep track of what functions you're in is filled up, you get the stack overflow error.
...
node.js global variables?
... single file that uses underscore, just like how in Java you do import com.foo.bar;. This makes it easier to figure out what your code is doing because the linkages between files are 'explicit'. Mildly annoying, but a good thing. .... That's the preaching.
There is an exception to every rule. I...
Struct like objects in Java
...etters. A possible solution would look like this:
public property String foo;
a->Foo = b->Foo;
Update: It's highly unlikely that property support will be added in Java 7 or perhaps ever. Other JVM languages like Groovy, Scala, etc do support this feature now. - Alex Miller
...
Save PL/pgSQL output from PostgreSQL to a CSV file
... you can use Postgresql's built in COPY command. e.g.
Copy (Select * From foo) To '/tmp/test.csv' With CSV DELIMITER ',' HEADER;
This approach runs entirely on the remote server - it can't write to your local PC. It also needs to be run as a Postgres "superuser" (normally called "root") because P...
C/C++ include header file order
...hm>
#include <set>
#include <vector>
#include <3rdparty/foo.h>
#include <3rdparty/bar.h>
#include "myproject/another.h"
#include "myproject/specific/bla.h"
#include "detail/impl.h"
Each group separated by a blank line from the next one:
Header corresponding to this ...
How does the C# compiler detect COM types?
...following code compiles and runs:
public class Program
{
public class Foo : IFoo
{
}
[Guid("00000000-0000-0000-0000-000000000000")]
[CoClass(typeof(Foo))]
[ComImport]
public interface IFoo
{
}
static void Main(string[] args)
{
IFoo foo = new IFo...