Tutorial by Examples: n

The ternary operator (?:) Support for the extended ternary operator was added in Twig 1.12.0. {{ foo ? 'yes' : 'no' }} Evaluates: if foo echo yes else echo no {{ foo ?: 'no' }} or {{ foo ? foo : 'no' }} Evaluates: if foo echo it, else echo no {{ foo ? 'yes' }} or {{ f...

In Kotlin, variable declarations look a bit different than Java's: val i : Int = 42 They start with either val or var, making the declaration final ("value") or variable. The type is noted after the name, separated by a : Thanks to Kotlin's type inference the explicit typ...

Kotlin uses == for equality (that is, calls equals internally) and === for referential identity. JavaKotlina.equals(b);a == ba == b;a === ba != b;a !== b See: https://kotlinlang.org/docs/reference/equality.html

You can use django rest framework permission classes to check request headers and authenticate user requests Define your secret_key on project settings API_KEY_SECRET = 'secret_value' note: a good practice is to use environment variables to store this secret value. Define a permission ...

Detailed instructions on getting windows-installer set up or installed.

Prior to iOS 7 when you want to scan a QR code, we might need to rely on third party frameworks or libraries like zBar or zXing. But Apple introduced AVCaptureMetaDataOutput from iOS 7 for reading barcodes. To read QR code using AVFoundation we need to setup/create AVCaptureSession and use captureO...

in Startup.cs // This method gets called by the runtime. Use this method to add services to the container. public void ConfigureServices(IServiceCollection services) { // Add framework services. services.AddMvc(); var controllerActivator = new CompositionRoot(); services...

One of the features in SugarCRM 7.x is being able to easily add and extend custom endpoints to accomplish what you require. In this example, we'll create a couple of custom endpoints to return some data about the request. This custom file is being placed in custom/clients/base/api/DescriptionAPI.p...

Both are used to define error handling for a website, but different software refers to different config elements. customErrors are a legacy (backwards compatable) element, used by Visual Studio Development Server (aka. VSDS or Cassini). httpErrors are the new element which is only used by IIS7. T...

A quick way to test your xpath is in your browser developer tool console. Format is $x('//insert xpath here') $ - specifies it is a selector. x - specifies it is using xpaths Example: $x("//button[text() ='Submit']") When this command is entered it will return all occurrences...

Suppose you want the user to select keywords from a menu, we can create a script similar to #!/usr/bin/env bash select os in "linux" "windows" "mac" do echo "${os}" break done Explanation: Here select keyword is used to loop through a list ...

Example of a TCA field configuration where you can select records from a table 'my_topfeatures' => array( 'label' => 'Select Topfeatures', 'config' => array( 'type' => 'group', 'internal_type' => 'db', 'size' => '4', ...

In Kotlin, if, try and others are expressions (so they do return a value) rather than (void) statements. So, for example, Kotlin does not have Java's ternary Elvis Operator, but you can write something like this: val i = if (someBoolean) 33 else 42 Even more unfamiliar, but equally expressive, ...

Create the Newsletter model: rails g model Newsletter name:string email:string subl app/models/newsletter.rb validates :name, presence: true validates :email, presence: true Create the Newsletter controller: rails g controller Newsletters create class NewslettersCont...

HTML <div class="countdown"></div> JS var duration = moment.duration({ 'minutes': 5, 'seconds': 00 }); var timestamp = new Date(0, 0, 0, 2, 10, 30); var interval = 1; var timer = setInterval(function() { timestamp = new Date(timestamp.getTi...

If a file is changed, but you don't like to commit it, set the file as "Assume unchanged" Revert "Assume unchanged" Need some steps:

Since Git 2.13, multiple usernames and email addresses could be configured by using a folder filter. Example for Windows: .gitconfig Edit: git config --global -e Add: [includeIf "gitdir:D:/work"] path = .gitconfig-work.config [includeIf "gitdir:D:/opensource/"] ...

If we want to remove some database connection from the list of database connections. we need to use QSqlDatabase::removeDatabase(),however it's a static function and the way it work is a little wired. // WRONG WAY QSqlDatabase db = QSqlDatabase::database("sales"); QSqlQuery query(&...

If you want to comment part of your code, then comment blocks may be useful. Comment block starts with a %{ in a new line and ends with %} in another new line: a = 10; b = 3; %{ c = a*b; d = a-b; %} This allows you fo fold the sections that you commented to make the code more clean and comp...

Here's an example with the technique(hack) invented by the dostips forums' user Liviu: @echo off echo Printed by CMD.EXE cscript //nologo "%~f0?.wsf" //job:JS //job:VBS exit /b %errorlevel% ----END OF BATCH CODE--- <package> <job id="JS"> <script...