Tutorial by Examples: sim

Enable draggable functionality on any DOM element. <script> $(function() { $( "#draggable" ).draggable(); }); </script> <div id="draggable" class="ui-widget-content"> <p>Drag me around</p> </div>

Interface and implementation of a simple category on NSArray, named Filter, with a single method that filters numbers. It is good practice to add a prefix (PF) to the method to ensure we don't overwrite any future NSArray methods. @interface NSArray (PFFilter) - (NSArray *)pf_filterSmaller:(dou...

An assertion is a statement used to assert that a fact must be true when that line of code is reached. Assertions are useful for ensuring that expected conditions are met. When the condition passed to an assertion is true, there is no action. The behavior on false conditions depends on compiler fl...

Using Item Sales Table from Example Database, let us calculate and show the total Quantity we sold of each Product. This can be easily done with a group by, but lets assume we to 'rotate' our result table in a way that for each Product Id we have a column. SELECT [100], [145] FROM (SELECT ItemI...

This example shows how to match an input against several values: def f(x: Int): String = x match { case 1 => "One" case 2 => "Two" case _ => "Unknown!" } f(2) // "Two" f(3) // "Unknown!" Live demo Note: _ is the fall th...

Consider this simple project with a flat directory structure: example |-- example.asd |-- functions.lisp |-- main.lisp |-- packages.lisp `-- tools.lisp The example.asd file is really just another Lisp file with little more than an ASDF-specific function call. Assuming your project depends o...

The first two arguments to format are an output stream and a control string. Basic use does not require additional arguments. Passing t as the stream writes to *standard-output*. > (format t "Basic Message") Basic Message nil That expression will write Basic Message to standard ou...

FROM node:5 The FROM directive specifies an image to start from. Any valid image reference may be used. WORKDIR /usr/src/app The WORKDIR directive sets the current working directory inside the container, equivalent to running cd inside the container. (Note: RUN cd will not change the current ...

public string Check() { string input = "Hello World!"; string pattern = @"W.rld"; // Hello Stack Overflow! return Regex.Replace(input, pattern, "Stack Overflow"); }

Some regex flavors (Perl, PCRE, Oniguruma, Boost) only support fixed-length lookbehinds, but offer the \K feature, which can be used to simulate variable-length lookbehind at the start of a pattern. Upon encountering a \K, the matched text up to this point is discarded, and only the text matching th...

Object initializers are handy when you need to create an object and set a couple of properties right away, but the available constructors are not sufficient. Say you have a class public class Book { public string Title { get; set; } public string Author { get; set; } // the rest o...

Documentation comments are placed directly above the method or class they describe. They begin with three forward slashes ///, and allow meta information to be stored via XML. /// <summary> /// Bar method description /// </summary> public void Bar() { } Information in...

A view can filter some rows from the base table or project only some columns from it: CREATE VIEW new_employees_details AS SELECT E.id, Fname, Salary, Hire_date FROM Employees E WHERE hire_date > date '2015-01-01'; If you select form the view: select * from new_employees_details IdFNam...

Active patterns are a special type of pattern matching where you can specify named categories that your data may fall into, and then use those categories in match statements. To define an active pattern that classifies numbers as positive, negative or zero: let (|Positive|Negative|Zero|) num = ...

From your project directory, run the go build command and specify the operating system and architecture target with the GOOS and GOARCH environment variables: Compiling for Mac (64-bit): GOOS=darwin GOARCH=amd64 go build Compiling for Windows x86 processor: GOOS=windows GOARCH=386 go build ...

// Execute a command a capture standard out. exec.Command creates the command // and then the chained Output method gets standard out. Use CombinedOutput() // if you want both standard out and standerr output out, err := exec.Command("echo", "foo").Output() if err != nil { ...

In PowerShell, there are many ways to achieve the same result. This can be illustrated nicely with the simple & familiar Hello World example: Using Write-Host: Write-Host "Hello World" Using Write-Output: Write-Output 'Hello world' It's worth noting that although Write-Outp...

Structure data types are useful way to package related data and have them behave like a single variable. Declaring a simple struct that holds two int members: struct point { int x; int y; }; x and y are called the members (or fields) of point struct. Defining and using structs: ...

We are going to be showing how to make a GET request to an API that responds with a JSON object or a JSON array. The first thing we need to do is add the Retrofit and GSON Converter dependencies to our module's gradle file. Add the dependencies for retrofit library as described in the Remarks secti...

What is a node.js module (link to article): A module encapsulates related code into a single unit of code. When creating a module, this can be interpreted as moving all related functions into a file. Now lets see an example. Imagine all files are in same directory: File: printer.js "use...