Tutorial by Examples: e

Reference types are comprised of both a reference to a memory area, and a value stored within that area. This is analogous to pointers in C/C++. All reference types are stored on what is known as the heap. The heap is simply a managed area of memory where objects are stored. When a new object is ...

In order to publish to a repository in Maven format ,“maven-publish” plugin for gradle can be used. The plugin should be added to build.gradle file in library module. apply plugin: 'maven-publish' You should define the publication and its identity attributes in build.gradle file too. This iden...

Gates are closures that determine if a user is allowed to perform a certain action on a resource. Gates are typically defined in the boot method of AuthServiceProvider and succinctly named to reflect what it's doing. An example of a gate that allows only premium users to view some content will look ...

To use the example above on a blade template to hide content from the user, you would typically do something like this: @can('view-content', $content) <! -- content here --> @endcan To completely prevent navigation to the content, you can do the following in your controller: if(Gate::a...

Policies are classes that help you organise authorisation logic around a model resource. Using our previous example, we might have a ContentPolicy that manages user access to the Content model. To make ContentPolicy, laravel provides an artisan command. Simply run php artisan make:policy ContentPo...

Writing Policies follows much the same pattern as writing Gates. The content permission gate can be rewritten as a Policy like this: function view($user, $content) { return $user->isSubscribedTo($content->id); } Policies can contain more methods as needed to take care of all authori...

Via The User model The Laravel User model contains two methods that help with authorisations using Policies; can and can't. These two can be used to determine if a user has authorisation or not on a model respectively. To check if a user can view a content or not, you can do the following: if($us...

These inspections are extremely useful for preventing NullPointerExceptions. By default they are disabled. You can find these inspections in Inspections preferences: Java | Probable bugs | Constant conditions & exceptions and @NotNull/@Nullable problems. There you can also configure your annotat...

tslint-microsoft-contrib tslint-eslint-rules codelyzer Yeoman genearator supports all these presets and can be extends also: generator-tslint

(From this answer) The example below adds an enumerated type to a postgres database. First, edit the migration file (created with mix ecto.gen.migration): def up do # creating the enumerated type execute("CREATE TYPE post_status AS ENUM ('published', 'editing')") # creating a...

So let's say you have an entity class like this: public class Person { public int PersonId { get; set; } public string Name { get; set; } public string ZipCode { get; set; } public string City { get; set; } public string AddressLine { get; set; } } And then let's say that...

And now let's say you want to do the opposite of entity splitting: instead of mapping one entity into two tables, you would like to map one table into two entities. This is called table splitting. Let's say you have one table with five columns: PersonId, Name, AddressLine, City, ZipCode, where Pers...

Apps written for macOS are usually written with Apple's Frameworks. The frameworks that almost every app will use are: AppKit - for creating and managing UI elements Foundation - for common non-UI objects and operations There are other common frameworks that are used in many, but not all apps...

aws ec2 describe-images --filters "Name=name,Values=${NAME_OF_AMI}"

This example uses the icarus verilog compiler. Step 1: Create a file called hello.v module myModule(); initial begin $display("Hello World!"); // This will display a message $finish ; // This causes the simulation to end. Without, it would go on..and on. end endm...

Install Xcode from the App Store. Install the Xcode developer tools > xcode-select --install This will provide basic command line tools such as gcc and make Install Mac Ports https://www.macports.org/install.php The OSX Sierra install package will provide an open-source method of ...

A library based on NETStandard 1.6 would look like this: { "version": "1.0.0", "dependencies": { "NETStandard.Library": "1.6.1", //nuget dependency }, "frameworks": { //frameworks the library is build for "netst...

Taken from microsoft's github page with official documentation { "name": String, //The name of the project, used for the assembly name as well as the name of the package. The top level folder name is used if this property is not specified. "version": String, //The Semver versi...

A simple example of project configuration for a .NetCore 1.1 Console App { "version": "1.0.0", "buildOptions": { "emitEntryPoint": true // make sure entry point is emitted. }, "dependencies": { }, "tools": { }, ...

NSE functions should be used in interactive programming. However, when developping new functions in a new package, it's better to use SE version. Load dplyr and lazyeval : library(dplyr) library(lazyeval) Filtering NSE version filter(mtcars, cyl == 8) filter(mtcars, cyl < 6) filter(mtca...