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What is the difference between 'my' and 'our' in Perl?
...just like my variables. You can see that in the following program: package Foo; our $x = 123; package Bar; say $x;. If you want to "declare" a package variable, you need to use use vars qw( $x );. our $x; declares a lexically-scoped variable that is aliased to the same-named variable in the package ...
Programmatically change log level in Log4j2
...logging.log4j.core.config.Configurator;
Configurator.setLevel("com.example.Foo", Level.DEBUG);
// You can also set the root logger:
Configurator.setRootLevel(Level.DEBUG);
Source
EDITED to reflect changes in the API introduced in Log4j2 version 2.0.2
If you wish to change the root logger level,...
throw Error('msg') vs throw new Error('msg')
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@pimvdb: true, I've changed it to Object => Object('foo') returns a string object... come to thing of it almost all native constructors is a bit wrong... Number, Boolean,Date,String all don't...Array, Object and Error do, but Event and all DOMxxxx-api constructors throw errors...
Check number of arguments passed to a Bash script
...h GNU test. It also happens to work with FreeBSD test, but may not work on foo test. The only standard comparison is = (just FYI).
– Martin Tournoij
Jul 22 '14 at 8:31
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Any reason to write the “private” keyword in C#?
...re restrictive than the other:
// Public getter, public setter
public int Foo { get; set; }
// Public getter, private setter
public int Bar { get; private set; }
I used to go with defaults everywhere I could, but I've been convinced (partly by Eric Lippert) that making it clear that you've thoug...
How do I tar a directory of files and folders without including the directory itself?
...iles to be processed. Consider the following command: tar --create --file=foo.tar -C /etc passwd hosts -C /lib libc.a" apl.jhu.edu/Misc/Unix-info/tar/tar_65.html I always try tar -czvf my_directory.tar.gz * -C my_directory and that does not work. -C location is important! Damn tar...
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How to validate an e-mail address in swift?
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Same as Cullen SUN, foo@bar return true.
– Rémy Virin
Oct 15 '15 at 23:22
4
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Sell me on const correctness
... with a common error that const correctness can protect you against:
void foo(const int DEFCON)
{
if (DEFCON = 1) //< FLAGGED AS COMPILER ERROR! WORLD SAVED!
{
fire_missiles();
}
}
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Make a URL-encoded POST request using `http.NewRequest(…)`
...m"
resource := "/user/"
data := url.Values{}
data.Set("name", "foo")
data.Set("surname", "bar")
u, _ := url.ParseRequestURI(apiUrl)
u.Path = resource
urlStr := u.String() // "https://api.com/user/"
client := &http.Client{}
r, _ := http.NewRequest(http.Method...
What is Node.js? [closed]
...exically scoped variables across call chains. ;) Like this:
var myData = "foo";
database.connect( 'user:pass', function myCallback( result ) {
database.query("SELECT * from Foo where id = " + myData);
} );
// Note that doSomethingElse() executes _BEFORE_ "database.query" which is inside a callb...