For security reasons, PowerShell is set up by default to only allow signed scripts to execute. Executing the following command will allow you to run unsigned scripts (you must run PowerShell as Administrator to do this).
Set-ExecutionPolicy RemoteSigned
Another way to run PowerShell scripts is t...
./mongo localhost:27017/mydb myjsfile.js
Explanation:
This operation executes the myjsfile.js script in a mongo shell that connects to the mydb database on the mongod instance accessible via the localhost interface on port 27017. localhost:27017 is not mandatory as this is the default port mongo...
If you are matching on an Option type:
def f(x: Option[Int]) = x match {
case Some(i) => doSomething(i)
case None => doSomethingIfNone
}
This is functionally equivalent to using fold, or map/getOrElse:
def g(x: Option[Int]) = x.fold(doSomethingIfNone)(doSomething)
def h(x: ...
If you want to add custom.js script that is located in the js/ folder of your theme, you'll need to enqueue it. In functions.php add
<?php
add_action( 'after_setup_theme', 'yourtheme_theme_setup' );
if ( ! function_exists( 'yourtheme_theme_setup' ) ) {
function yourtheme_theme_setup()...
In the VBA Editor window, from the Tools menu select "Options":
Then in the "Editor" tab, make sure that "Require Variable Declaration" is checked:
Selecting this option will automatically put Option Explicit at the top of every VBA module.
Small note: This is ...
Trim is used to remove write-space at the beginning or end of selection
In MSSQL there is no single TRIM()
SELECT LTRIM(' Hello ') --returns 'Hello '
SELECT RTRIM(' Hello ') --returns ' Hello'
SELECT LTRIM(RTRIM(' Hello ')) --returns 'Hello'
MySql and Oracle
SELECT TRIM(' Hello ') ...
// The Option type can either contain Some value or None.
fn find(value: i32, slice: &[i32]) -> Option<usize> {
for (index, &element) in slice.iter().enumerate() {
if element == value {
// Return a value (wrapped in Some).
return Some(index);...
The filter or map functions should often be replaced by list comprehensions. Guido Van Rossum describes this well in an open letter in 2005:
filter(P, S) is almost always written clearer as [x for x in S if P(x)], and this has the huge advantage that the most common usages involve predicates tha...
MATLAB code can be saved in m-files to be reused. m-files have the .m extension which is automatically associated with MATLAB. An m-file can contain either a script or functions.
Scripts
Scripts are simply program files that execute a series of MATLAB commands in a predefined order.
Scripts do no...
fn main() {
let maybe_cake = Some("Chocolate cake");
let not_cake = None;
// The unwrap method retrieves the value from the Option
// and panics if the value is None
println!("{}", maybe_cake.unwrap());
// The expect method works much like the un...
When NSLog is asked to print empty string, it omits the log completely.
NSString *name = @"";
NSLog(@"%@", name); // Resolves to @""
The above code will print nothing.
It is a good practice to prefix logs with labels:
NSString *name = @"";
NSLog(@&quo...
By default the Python random module use the Mersenne Twister PRNG to generate random numbers, which, although suitable in domains like simulations, fails to meet security requirements in more demanding environments.
In order to create a cryptographically secure pseudorandom number, one can use Syst...
On either Linux/UNIX or Windows, a script can be passed as an argument to the PHP executable, with that script's options and arguments following:
php ~/example.php foo bar
c:\php\php.exe c:\example.php foo bar
This passes foo and bar as arguments to example.php.
On Linux/UNIX, the preferred me...
Descriptors are objects that are (usually) attributes of classes and that have any of __get__, __set__, or __delete__ special methods.
Data Descriptors have any of __set__, or __delete__
These can control the dotted lookup on an instance, and are used to implement functions, staticmethod, classmet...
In order to specify which version of python the Linux shell should use the first line of Python scripts can be a shebang line, which starts with #!:
#!/usr/bin/python
If you are in a virtual environment, then python myscript.py will use the Python from your virtual environment, but ./myscript.py...
You can use Optional Chaining in order to call a method, access a property or subscript an optional. This is done by placing a ? between the given optional variable and the given member (method, property or subscript).
struct Foo {
func doSomething() {
print("Hello World!")
...
OptionSetType is a protocol designed to represent bit mask types where individual bits represent members of the set. A set of logical and/or functions enforce the proper syntax:
struct Features : OptionSet {
let rawValue : Int
static let none = Features(rawValue: 0)
static let feature0 = F...
Generally speaking, empty commits (or commits with state that is identical to the parent) is an error.
However, when testing build hooks, CI systems, and other systems that trigger off a commit, it's handy to be able to easily create commits without having to edit/touch a dummy file.
The --allow-e...
