Tutorial by Examples: io

Named functions function multiply(a, b) { return a * b; } Anonymous functions let multiply = function(a, b) { return a * b; }; Lambda / arrow functions let multiply = (a, b) => { return a * b; };

Haskell is a pure language, meaning that expressions cannot have side effects. A side effect is anything that the expression or function does other than produce a value, for example, modify a global counter or print to standard output. In Haskell, side-effectful computations (specifically, those wh...

Here is how to make a Heads Up Notification for capable devices, and use a Ticker for older devices. // Tapping the Notification will open up MainActivity Intent i = new Intent(this, MainActivity.class); // an action to use later // defined as an app constant: // public static final String ME...

Using Razor @functions keyword gives the capability of introducing classes and methods for inline use within a Razor file: @functions { string GetCssClass(Status status) { switch (status) { case Status.Success: return "alert-success&qu...

We can use partial application to "lock" the first argument. After applying one argument we are left with a function which expects one more argument before returning the result. (+) :: Int -> Int -> Int addOne :: Int -> Int addOne = (+) 1 We can then use addOne in order to...

Returning partially applied functions is one technique to write concise code. add :: Int -> Int -> Int add x = (+x) add 5 2 In this example (+x) is a partially applied function. Notice that the second parameter to the add function does not need to be specified in the function definitio...

For Addition "4" + 2 # Gives "42" 4 + "2" # Gives 6 1,2,3 + "Hello" # Gives 1,2,3,"Hello" "Hello" + 1,2,3 # Gives "Hello1 2 3" For Multiplication "3" * 2 # Gives "33" 2 * "3&quot...

A type has value semantics if the object's observable state is functionally distinct from all other objects of that type. This means that if you copy an object, you have a new object, and modifications of the new object will not be in any way visible from the old object. Most basic C++ types have v...

Setup monitoring beacons func initiateRegion(ref:BeaconHandler){ let uuid: NSUUID = NSUUID(UUIDString: "<UUID>") let beacon = CLBeaconRegion(proximityUUID: uuid, identifier: "") locationManager?.requestAlwaysAuthorization() //cllocation manager obj. ...

Model using System.ComponentModel.DataAnnotations; public class ViewModel { [Required(ErrorMessage="Name is required")] public string Name { get; set; } [StringLength(14, MinimumLength = 14, ErrorMessage = "Invalid Phone Number")] [Required(ErrorMessag...

Remote Validation used to check whether the content enter in the input control is valid or not by sending an ajax request to server side to check it. Working The RemoteAttribute works by making an AJAX call from the client to a controller action with the value of the field being validated. The con...

PL/SQL (Procedural Language/Structured Query Language) is Oracle Corporation's procedural extension for SQL and the Oracle relational database. PL/SQL is available in Oracle Database (since version 7), TimesTen in-memory database (since version 11.2.1), and IBM DB2 (since version 9.7). The basic un...

Once the Symfony Installer is available, create your first Symfony application with the new command: # Linux, Mac OS X $ symfony new my_project_name # Windows c:\> cd projects/ c:\projects\> php symfony new my_project_name This command can be run from anywhere, not necessarily from t...

In case your project needs to be based on a specific Symfony version, use the optional second argument of the new command: # use the most recent version in any Symfony branch $ symfony new my_project_name 2.8 $ symfony new my_project_name 3.1 # use a specific Symfony version $ symfony new my_...

In Kotlin you could write code like: val x: Path = Paths.get("dirName").apply { if (Files.notExists(this)) throw IllegalStateException("The important file does not exist") } But the use of apply is not that clear as to your intent. Sometimes it is clearer to create a ...

If you want to extend a class as-if you are a static function, for example for class Something add static looking function fromString, this can only work if the class has a companion object and that the extension function has been declared upon the companion object: class Something { compani...

Kotlin allows us to provide implementations for a predefined set of operators with fixed symbolic representation (like + or *) and fixed precedence. To implement an operator, we provide a member function or an extension function with a fixed name, for the corresponding type. Functions that overload ...

NumPy is available in the default repositories of most popular Linux distributions and can be installed in the same way that packages in a Linux distribution are usually installed. Some Linux distributions have different NumPy packages for Python 2.x and Python 3.x. In Ubuntu and Debian, install nu...

Let's say we want to replace only numbers with 2 digits: regular expression will find them with (\d\d) SELECT REGEXP_REPLACE ('2, 5, and 10 are numbers in this example', '(\d\d)', '#') FROM dual; Results in: '2, 5, and # are numbers in this example' If I want to swap parts of the text, I us...

PL/SQL Function: CREATE OR REPLACE FUNCTION split_String( i_str IN VARCHAR2, i_delim IN VARCHAR2 DEFAULT ',' ) RETURN SYS.ODCIVARCHAR2LIST DETERMINISTIC AS p_result SYS.ODCIVARCHAR2LIST := SYS.ODCIVARCHAR2LIST(); p_start NUMBER(5) := 1; p_end NUMBER(5); ...