Tutorial by Examples | RIP Tutorial

Mutating a Struct

A method of a struct that change the value of the struct itself must be prefixed with the mutating keyword struct Counter { private var value = 0 mutating func next() { value += 1 } } When you can use mutating methods The mutating methods are only available on str...

Swift Language • Structs

Timing Out with Interrupt and then Kill

c := exec.Command(name, arg...) b := &bytes.Buffer{} c.Stdout = b c.Stdin = stdin if err := c.Start(); err != nil { return nil, err } timedOut := false intTimer := time.AfterFunc(timeout, func() { log.Printf("Process taking too long. Interrupting: %s %s", name, strings...

Go • Executing Commands

Simple Command Execution

// 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 { ...

Go • Executing Commands

Executing a Command then Continue and Wait

cmd := exec.Command("sleep", "5") // Does not wait for command to complete before returning err := cmd.Start() if err != nil { log.Fatal(err) } // Wait for cmd to Return err = cmd.Wait() log.Printf("Command finished with error: %v", err)

Go • Executing Commands

Select rows that match a condition

Generally, the syntax is: SELECT <column names> FROM <table name> WHERE <condition> For example: SELECT FirstName, Age FROM Users WHERE LastName = 'Smith' Conditions can be complex: SELECT FirstName, Age FROM Users WHERE LastName = 'Smith' AND (City = 'New York' OR C...

Microsoft SQL Server • Getting started with Microsoft SQL Server

Include Guards

A header file may be included by other header files. A source file (compilation unit) that includes multiple headers may therefore, indirectly, include some headers more than once. If such a header file that is included more than once contains definitions, the compiler (after preprocessing) dete...

C++ • Preprocessor

Conditional logic and cross-platform handling

In a nutshell, conditional pre-processing logic is about making code-logic available or unavailable for compilation using macro definitions. Three prominent use-cases are: different app profiles (e.g. debug, release, testing, optimised) that can be candidates of the same app (e.g. with extra log...

C++ • Preprocessor

Macros

Macros are categorized into two main groups: object-like macros and function-like macros. Macros are treated as a token substitution early in the compilation process. This means that large (or repeating) sections of code can be abstracted into a preprocessor macro. // This is an object-like macro ...

C++ • Preprocessor

Aliases & Similar Functions

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...

PowerShell • Getting started with PowerShell

Execution of a JavaScript file in MongoDB

./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...

MongoDB • Getting started with MongoDB

Uppercase and Lowercase Strings

To make all the characters in a String uppercase or lowercase: 2.2 let text = "AaBbCc" let uppercase = text.uppercaseString // "AABBCC" let lowercase = text.lowercaseString // "aabbcc" 3.0 let text = "AaBbCc" let uppercase = text.uppercased() // &qu...

Swift Language • Strings and Characters

Basic API Usage

It can also be installed by downloading the source code and placing it in a directory of your project. However there are many benefits to using composer. require '/path/to/lib/Twig/Autoloader.php'; Twig_Autoloader::register(); $loader = new Twig_Loader_Filesystem('/path/to/templates'); $opti...

twig • Getting started with twig

Installation or Setup

Basic installation: You can download redux javascript file, using this link. Also you can install redux, using bower : bower install https://npmcdn.com/redux@latest/dist/redux.min.js Next, you need to include redux to your page: <html> <head> <script type="text/jav...

redux • Getting started with redux

Filtering an array

In order to filter out values from an array and obtain a new array containing all the values that satisfy the filter condition, you can use the array_filter function. Filtering non-empty values The simplest case of filtering is to remove all "empty" values: $my_array = [1,0,2,null,3,'',...

PHP • Manipulating an Array

Get product by sku

$sku = 'sku-goes-here'; $product = Mage::getModel('catalog/product')->loadByAttribute('sku', $sku);

magento • Get Products from Database

Get product by ID

$id = 1; $product = Mage::getModel('catalog/product')->load($id); if($product->getId()){ //product was found }

magento • Get Products from Database

Product collection - LIKE query

$collection = Mage::getModel('catalog/product')->getCollection(); $collection->addAttributeToFilter('sku', array('like' => 'UX%'));

magento • Get Products from Database

Get product collection by attribute

$collection = Mage::getModel('catalog/product')->getCollection(); // Using operator $collection->addAttributeToFilter('status', array('eq' => 1)); // Without operator (automatically uses 'equal' operator $collection->addAttributeToFilter('status', 1);

magento • Get Products from Database

Matching on an Option

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: ...

Scala Language • Pattern Matching