Tutorial by Examples: i

While composer provides a system to manage dependencies for PHP projects (e.g. from Packagist), it can also notably serve as an autoloader, specifying where to look for specific namespaces or include generic function files. It starts with the composer.json file: { // ... "autoload&q...

Ember comes with a built in helper that will provide computed properties for the status of an asynchronous task. Pros Built in – no need for an addon. Can be managed in the life cycle of a component. Provides convenient state properties that can drive the template logic. Cons Must be wra...

After creating a new model or modifying existing models, you will need to generate migrations for your changes and then apply the migrations to the specified database. This can be done by using the Django's built-in migrations system. Using the manage.py utility when in the project root directory: ...

Units of measure are additional type annotations that can be added to floats or integers. They can be used to verify at compile time that calculations are using units consistently. To define annotations: [<Measure>] type m // meters [<Measure>] type s // seconds [<Measure>] typ...

You can use traits to modify methods of a class, using traits in stackable fashion. The following example shows how traits can be stacked. The ordering of the traits are important. Using different order of traits, different behavior is achieved. class Ball { def roll(ball : String) = println(&q...

We can name our loops and break the specific one when necessary. outerloop: for (var i = 0;i<3;i++){ innerloup: for (var j = 0;j <3; j++){ console.log(i); console.log(j); if (j == 1){ break outerloop; } } } Output: 0 0...

Detailed instructions on getting asp.net-web-api set up or installed.

While many people think that ^ means the start of a string, it actually means start of a line. For an actual start of string anchor use, \A. The string hello\nworld (or more clearly) hello world Would be matched by the regular expressions ^h, ^w and \Ah but not by \Aw

With IronPython you can access any .net assembly which is compiled using the same or a lower version than the IronPython core. Example: Importing a a .net assembly and class from System import Math Example: Using an imported class: from System import Math print Math.Abs(-123) You can also lo...

Statistical functions in R make heavy use of the so-called Wilkinson-Rogers formula notation1 . When running model functions like lm for the Linear Regressions, they need a formula. This formula specifies which regression coefficients shall be estimated. my_formula1 <- formula(mpg ~ wt) class(...

//1) All attributes should be inherited from System.Attribute //2) You can customize your attribute usage (e.g. place restrictions) by using System.AttributeUsage Attribute //3) You can use this attribute only via reflection in the way it is supposed to be used //4) MethodMetadataAttribute is jus...

[StackDemo(Text = "Hello, World!")] public class MyClass { [StackDemo("Hello, World!")] static void MyMethod() { } }

Method GetCustomAttributes returns an array of custom attributes applied to the member. After retrieving this array you can search for one or more specific attributes. var attribute = typeof(MyClass).GetCustomAttributes().OfType<MyCustomAttribute>().Single(); Or iterate through them forea...

To find out the IP address of your container, use: docker inspect <container id> | grep IPAddress or use docker inspect docker inspect --format '{{ .NetworkSettings.IPAddress }}' ${CID}

Payments Table CustomerPayment_typeAmountPeterCredit100PeterCredit300JohnCredit1000JohnDebit500 select customer, sum(case when payment_type = 'credit' then amount else 0 end) as credit, sum(case when payment_type = 'debit' then amount else 0 end) as debit from payments group by ...

If you need to remove one or more elements from a slice, or if you need to work with a sub slice of another existing one; you can use the following method. Following examples uses slice of int, but that works with all type of slice. So for that, we need a slice, from witch we will remove some ...

Doctrine 2 is easy to install via composer composer require doctrine/orm but it can also be downloaded from http://www.doctrine-project.org/projects/orm.html or from its GitHub project page.

ActionScript 3 can be used by installing the Adobe AIR SDK or Apache Flex SDK or as part Adobe's Animate CC product (formerly known as Flash Professional). Adobe Animate CC is a professional software solution that can be used to create AS3 projects using visual tools - once installed, no further st...

A while loop will evaluate a condition and if true will perform an action. As long as the condition evaluates to true the action will continue to be performed. while(condition){ code_block } The following example creates a loop that will count down from 10 to 0 $i = 10 while($i -ge 0){ ...

A command shell is a command line interface computer program to an operating system. Some Variants 1. Bash : Comes as default shell on ubuntu 2. KornShell(ksh) : To install ksh in Ubuntu $ sudo apt-get install ksh To start working with ksh $ ksh $ ps $$ PID TTY STAT ...