Sometimes a term is defined in multiple sections of the manual. By default, man will only display the first page it finds, which can be annoying for programmers because C functions are documented in a later section than commands and system calls. Use the following to display all pages that match a...
When you need to pass a collection into a Java method:
import scala.collection.JavaConverters._
val scalaList = List(1, 2, 3)
JavaLibrary.process(scalaList.asJava)
If the Java code returns a Java collection, you can turn it into a Scala collection in a similar manner:
import scala.collectio...
To create minification-safe angular controllers, you will change the controller function parameters.
The second argument in the module.controller function should be passed an array, where the last parameter is the controller function, and every parameter before that is the name of each injected val...
In Elixir, a common practice is to use anonymous functions. Creating an anonymous function is simple:
iex(1)> my_func = fn x -> x * 2 end
#Function<6.52032458/1 in :erl_eval.expr/5>
The general syntax is:
fn args -> output end
For readability, you may put parenthesis around t...
A metatable defines a set of operations which alter the behaviour of a lua object. A metatable is just an ordinary table, which is used in a special way.
local meta = { } -- create a table for use as metatable
-- a metatable can change the behaviour of many things
-- here we modify the 'tostrin...
To create a background session
// Swift:
let mySessionID = "com.example.bgSession"
let bgSessionConfig = NSURLSessionConfiguration.backgroundSessionConfigurationWithIdentifier(mySessionID)
let session = NSURLSession(configuration: bgSessionConfig)
// add tasks here
//...
Ionic Framework
A Cross-platform mobile application development framework using Angular JS and Front End web technologies.
Official website: http://ionicframework.com/
Documentation: http://ionicframework.com/docs/
Installation and Setup
Installation
Ionic required NPM(Node Package Manager) an...
By default a property is a primary key if a property on a class is named “ID” (not case sensitive), or the class name followed by "ID". If the type of the primary key property is numeric or GUID it will be configured as an identity column. Simple Example:
public class Room
{
// Pri...
The Windows API documentation for functions taking one or more string as argument will usually look like this:
BOOL WINAPI CopyFile(
_In_ LPCTSTR lpExistingFileName,
_In_ LPCTSTR lpNewFileName,
_In_ BOOL bFailIfExists
);
The datatype for the two string parameters is made of several ...
To get version 5394 use:
svn co --revision r5394 https://svn.example.com/svn/MyRepo/MyProject/trunk
Or the shorter version:
svn co -r 5394 https://svn.example.com/svn/MyRepo/MyProject/trunk
Or by using pegged revisions:
svn co https://svn.example.com/svn/MyRepo/MyProject/trunk@5394
If al...
Dynamic scoping means that variable lookups occur in the scope where a function is called, not where it is defined.
$ x=3
$ func1 () { echo "in func1: $x"; }
$ func2 () { local x=9; func1; }
$ func2
in func1: 9
$ func1
in func1: 3
In a lexically scoped language, func1 would alway...
Suppose we want to receive a function as a parameter, we can do it like this:
function foo(otherFunc: Function): void {
...
}
If we want to receive a constructor as a parameter:
function foo(constructorFunc: { new() }) {
new constructorFunc();
}
function foo(constructorWithParams...
Class composition allows explicit relations between objects. In this example, people live in cities that belong to countries. Composition allows people to access the number of all people living in their country:
class Country(object):
def __init__(self):
self.cities=[]
...
The steps of overload resolution are:
Find candidate functions via name lookup. Unqualified calls will perform both regular unqualified lookup as well as argument-dependent lookup (if applicable).
Filter the set of candidate functions to a set of viable functions. A viable function for whi...
Recursion can be defined as:
A method that calls itself until a specific condition is met.
An excellent and simple example of recursion is a method that will get the factorial of a given number:
public int Factorial(int number)
{
return number == 0 ? 1 : n * Factorial(number - 1);
}
...
Enums are iterable:
class Color(Enum):
red = 1
green = 2
blue = 3
[c for c in Color] # [<Color.red: 1>, <Color.green: 2>, <Color.blue: 3>]
Add this permission to the manifest file to use Bluetooth features in your application:
<uses-permission android:name="android.permission.BLUETOOTH" />
If you need to initiate device discovery or manipulate Bluetooth settings, you also need to add this permission:
<uses-permi...
