Tutorial by Examples: al

cd ~/Projects valet park This command will register your current working directory as a path that Valet should search for sites. Now, any Laravel project you create within your "parked" directory will automatically be served using the http://folder-name.dev convention.

Using the Control.Invoke() method you may move the execution of a method or function from a background thread to the thread that the control was created on, which is usually the UI (User Interface) thread. By doing so your code will be queued to run on the control's thread instead, which removes the...

# no error, even the subscript is out of range. julia> sub2ind((3,3), 3, 4) 12 One cannot determine whether a subscript is in the range of an array by comparing its index: julia> sub2ind((3,3), -1, 2) 2 julia> 0 < sub2ind((3,3), -1, 2) <= 9 true

C++11 Deriving a class may be forbidden with final specifier. Let's declare a final class: class A final { }; Now any attempt to subclass it will cause a compilation error: // Compilation error: cannot derive from final class: class B : public A { }; Final class may appear anywhere in cl...

In contrast of a full template specialization partial template specialization allows to introduce template with some of the arguments of existing template fixed. Partial template specialization is only available for template class/structs: // Common case: template<typename T, typename U> st...

Once a model object has been fetched, it becomes a fully realized instance of the class. As such, any additional methods can be accessed in forms and serializers (like Django Rest Framework). Using python properties is an elegant way to represent additional values that are not stored in the databa...

While Value Converters can be comprised of either a toView or fromView method, in the below example we will be creating a basic Value Converter which just uses the toView method which accepts the value being sent to the view as the first argument. to-uppercase.js export class ToUppercaseValueConve...

A bi-directional value converter utilizes two methods in your Value Converter class: toView and fromView these methods are aptly named to signify which direction the data is flowing. In our example we will be creating a prepend Value Converter which will make sure that an amount entered in our app ...

A Value Converter can be used alongside other value converters and you can infinitely chain them using the | pipe separator. ${myString | toUppercase | removeCharacters:'&,%,-,+' | limitTo:25} The above theoretical example firstly applies toUppercase which capitalizes our string. Then it app...

You should use caution when using setState in an asynchronous context. For example, you might try to call setState in the callback of a get request: class MyClass extends React.Component { constructor() { super(); this.state = { user: {} }; } ...

public function up() { $this->dropColumn('post', 'position'); $this->renameColumn('post', 'owner_id', 'user_id'); $this->alterColumn('post', 'updated', $this->timestamp()->notNull()->defaultValue('0000-00-00 00:00:00')); }

public function safeUp() { $this->createTable('news', [ 'id' => $this->primaryKey(), 'title' => $this->string()->notNull(), 'content' => $this->text(), ]); $this->insert('news', [ 'title' => 'test 1', 'conte...

AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder( MainActivity.this); alertDialogBuilder.setTitle("Title Dialog"); alertDialogBuilder .setMessage("Message Dialog") .setCancelable(true) ...

Installation Requirements The minimum requirement by this project template is that your Web server supports PHP 5.4.0. Yii2-advanced-app can be installed in two ways. They are Installing via Composer Installing from an Archive File 1) Installing via Composer If you do not already have Comp...

First, download the compiler and components. Next, add Swift to your path. On macOS, the default location for the downloadable toolchain is /Library/Developer/Toolchains. Run the following command in Terminal: export PATH=/Library/Developer/Toolchains/swift-latest.xctoolchain/usr/bin:"${PATH}...

Program units often make use of literal constants. These cover the obvious cases like print *, "Hello", 1, 1.0 Except in one case, each literal constant is a scalar which has type, type parameters and value given by the syntax. Integer literal constants are of the form 1 -1 -1_1 ...

You can call a function in Racket by wrapping it in parentheses with the arguments after it. This looks like (function argument ...). > (define (f x) x) > (f 1) 1 > (f "salmon") "salmon" > (define (g x y) (string-append x y)) > (g "large" "sal...

The 0b prefix can be used to represent Binary literals. Binary literals allow constructing numbers from zeroes and ones, which makes seeing which bits are set in the binary representation of a number much easier. This can be useful for working with binary flags. The following are equivalent ways o...

Local functions are defined within a method and aren't available outside of it. They have access to all local variables and support iterators, async/await and lambda syntax. This way, repetitions specific to a function can be functionalized without crowding the class. As a side effect, this improves...

Define AccumulatorParam import org.apache.spark.AccumulatorParam object StringAccumulator extends AccumulatorParam[String] { def zero(s: String): String = s def addInPlace(s1: String, s2: String)= s1 + s2 } Use: val accumulator = sc.accumulator("")(StringAccumulator) sc.pa...