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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...

A commonly used CSS/Javascript library is Bootstrap. To install it into your Aurelia CLI driven application first you need to install it using Npm. npm install bootstrap --save Because Bootstrap has a hard dependency on jQuery, we need to make sure we also have jQuery installed: npm install jqu...

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 ...

Similar to hsl() notation, but with an added alpha (opacity) value. hsla(240, 100%, 50%, 0) /* transparent */ hsla(240, 100%, 50%, 0.5) /* half-translucent blue */ hsla(240, 100%, 50%, 1) /* fully opaque blue */ Syntax hsla(<hue>, <saturation>%, <lightness>%, <a...

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: {} }; } ...

Stateless components are getting their philosophy from functional programming. Which implies that: A function returns all time the same thing exactly on what is given to it. For example: const statelessSum = (a, b) => a + b; let a = 0; const statefulSum = () => a++; As you can see fro...

Create project using STS (Spring Starter Project) or Spring Initializr (at https://start.spring.io ). Add a Web Dependency in your pom.xml: <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId&...

Recursion occurs when a function call causes that same function to be called again before the original function call terminates. For example, consider the well-known mathematical expression x! (i.e. the factorial operation). The factorial operation is defined for all nonnegative integers as follows:...

ng-repeat is a built in directive in Angular which lets you iterate an array or an object and gives you the ability to repeat an element once for each item in the collection. ng-repeat an array <ul> <li ng-repeat="item in itemCollection"> {{item.Name}} </...

First define the service (in this case it uses the factory pattern): .factory('dataService', function() { var dataObject = {}; var service = { // define the getter method get data() { return dataObject; }, // define the setter method ...

updateState by key can be used to create a stateful DStream based on upcoming data. It requires a function: object UpdateStateFunctions { def updateState(current: Seq[Double], previous: Option[StatCounter]) = { previous.map(s => s.merge(current)).orElse(Some(StatCounter(current))) } ...

mapWithState, similarly to updateState, can be used to create a stateful DStream based on upcoming data. It requires StateSpec: import org.apache.spark.streaming._ object StatefulStats { val state = StateSpec.function( (key: String, current: Option[Double], state: State[StatCounter]) =&g...

/** * @param n Number to be rounded. * @param precision Decimal places. * @return Rounded Number */ function roundDecimal(n:Number, precision:Number):Number { var factor:int = Math.pow(10, precision); return (Math.round(n * factor) / factor); } Examples: trace(0.9 - 1); // -0...

package { import flash.events.Event; public class CustomEvent extends Event { public static const START:String = "START"; public static const STOP:String = "STOP"; public var data:*; public function CustomEvent(type:Strin...

function today(date:Date = null):Date { if (date == null) date = new Date(); return new Date(date.fullYear, date.month, date.date, 0, 0, 0, 0); }

The right-hand side of the assignment in a for loop can be any row vector. The left-hand side of the assignment can be any valid variable name. The for loop assigns a different element of this vector to the variable each run. other_row_vector = [4, 3, 5, 1, 2]; for any_name = other_row_vector ...

If the right-hand side of the assignment is a matrix, then in each iteration the variable is assigned subsequent columns of this matrix. some_matrix = [1, 2, 3; 4, 5, 6]; % 2 by 3 matrix for some_column = some_matrix display(some_column) end (The row vector version is a normal case of thi...

yii migrate/create <name> The required name argument gives a brief description about the new migration. For example, if the migration is about creating a new table named news, you may use the name create_news_table and run the following command yii migrate/create create_news_table

<?php use yii\db\Migration; class m150101_185401_create_news_table extends Migration { public function up() { } public function down() { echo "m101129_185401_create_news_table cannot be reverted.\n"; return false; } /* // Use safeUp/safeDown to run migra...