We can bind a class as a Singleton:
public function register()
{
App::singleton('my-database', function()
{
return new Database();
});
}
This way, the first time an instance of 'my-database' will be requested to the service container, a new instance will be created. Al...
Equality
For basic equality testing, the equal operator == is used. For more comprehensive checks, use the identical operator ===.
The identical operator works the same as the equal operator, requiring its operands have the same value, but also requires them to have the same data type.
For exampl...
from pandas_datareader import data
# Only get the adjusted close.
aapl = data.DataReader("AAPL",
start='2015-1-1',
end='2015-12-31',
data_source='yahoo')['Adj Close']
>>> aapl.plot(title='AAPL Adj. C...
chrome.runtime.getManifest() returns the extension's manifest in a form of a parsed object.
This method works both on content scripts and all extension pages, it requires no permissions,
Example, obtaining the extension's version string:
var version = chrome.runtime.getManifest().version;
Using the Control.Invoke() method you may move the execution of a method or function from a background thread to the thread that the control was created on, which is usually the UI (User Interface) thread. By doing so your code will be queued to run on the control's thread instead, which removes the...
This method will work on modern versions of Arch, CentOS, CoreOS, Debian, Fedora, Mageia, openSUSE, Red Hat Enterprise Linux, SUSE Linux Enterprise Server, Ubuntu, and others. This wide applicability makes it an ideal as a first approach, with fallback to other methods if you need to also identify o...
# no error, even the subscript is out of range.
julia> sub2ind((3,3), 3, 4)
12
One cannot determine whether a subscript is in the range of an array by comparing its index:
julia> sub2ind((3,3), -1, 2)
2
julia> 0 < sub2ind((3,3), -1, 2) <= 9
true
The default namespace is the namespace corresponding to the absence of any prefix. It can be declared with the special xmlns attribute.
<?xml version="1.0"?>
<foo xmlns="http://www.example.com/my-namespace">
<!-- the element foo is in the namespace
htt...
Elements and attributes behave differently with respect to default namespaces. This is often the source of confusion.
An attribute whose name has no prefix lives in no namespace, also when a default namespace is in scope.
<?xml version="1.0"?>
<foo attr="value" xmlns=...
A namespace binding (special xmlns or xmlns:... attribute) is in scope for all the descendants of the enclosing element, including this element.
<?xml version="1.0"?>
<root>
<my:element xmlns:my="http://www.example.com/ns1">
<!-- here, the prefix my...
Dim inputCode As Integer = Console.Read()
Console.Read() awaits input from the user and, upon receipt, returns an integer value corresponding with the character code of the entered character. If the input stream is ended in some way before input can be obtained, -1 is returned instead.
Dim inputChar As ConsoleKeyInfo = Console.ReadKey()
Console.ReadKey() awaits input from the user and, upon receipt, returns an object of class ConsoleKeyInfo, which holds information relevant to the character which the user provided as input. For detail regarding the information provided, visit t...
itertools.takewhile enables you to take items from a sequence until a condition first becomes False.
def is_even(x):
return x % 2 == 0
lst = [0, 2, 4, 12, 18, 13, 14, 22, 23, 44]
result = list(itertools.takewhile(is_even, lst))
print(result)
This outputs [0, 2, 4, 12, 18].
Not...
itertools.dropwhile enables you to take items from a sequence after a condition first becomes False.
def is_even(x):
return x % 2 == 0
lst = [0, 2, 4, 12, 18, 13, 14, 22, 23, 44]
result = list(itertools.dropwhile(is_even, lst))
print(result)
This outputs [13, 14, 22, 23, 44].
...
C++11
Deriving a class may be forbidden with final specifier. Let's declare a final class:
class A final {
};
Now any attempt to subclass it will cause a compilation error:
// Compilation error: cannot derive from final class:
class B : public A {
};
Final class may appear anywhere in cl...
Addition + and subtraction - operations can be used to combine delegate instances. The delegate contains a list of the assigned delegates.
using System;
using System.Reflection;
using System.Reflection.Emit;
namespace DelegatesExample {
class MainClass {
private delegate void MyD...
In contrast of a full template specialization partial template specialization allows to introduce template with some of the arguments of existing template fixed. Partial template specialization is only available for template class/structs:
// Common case:
template<typename T, typename U>
st...
Once a model object has been fetched, it becomes a fully realized instance of the class. As such, any additional methods can be accessed in forms and serializers (like Django Rest Framework).
Using python properties is an elegant way to represent additional values that are not stored in the databa...
This example will show you how to quickly get a hello world Aurelia application up and running using the Aurelia CLI.
Prerequisites
The Aurelia CLI is a Node.js based application, so make sure you install it first before proceeding. You will need Node.js 4.4.7 or later.
You will also need a Git c...
