Tutorial by Examples: f

Dart allows to easily filter a list using where. var fruits = ['apples', 'oranges', 'bananas']; fruits.where((f) => f.startsWith('a')).toList(); //apples Of course you can use some AND or OR operators in your where clause.

An inner class which is visible to any outside class can be created from this class as well. The inner class depends on the outside class and requires a reference to an instance of it. To create an instance of the inner class, the new operator only needs to be called on an instance of the outer cla...

ember install ember-bootstrap

npm install --save-dev ember-cli-sass ember install ember-cli-foundation-6-sass

ember g ember-cli-foundation-6-sass

// ember-cli-build.js /* global require, module */ var EmberApp = require('ember-cli/lib/broccoli/ember-app'); module.exports = function(defaults) { var app = new EmberApp(defaults, { // Add options here 'ember-cli-foundation-6-sass': { 'foundationJs': [ ...

{{#bs-form model=this onSubmit=(action "submit") as |form|}} {{#form.element label="Email" placeholder="Email" property="email" as |el|}} <div class="input-group"> <input value={{el.value}} class="form-control" place...

1. Enable Flat Categories and Products One of the top reasons of Magento speed issues with database read speed. To fasten the read speed of the database you should enable Flat Catalog. This will minify the number of database joins done when showing products and due to that the MySQL query complexit...

To discovery the default print service, we can use the PrintServiceLookup class. Let's see how:: import javax.print.PrintService; import javax.print.PrintServiceLookup; public class DiscoveringDefaultPrintService { public static void main(String[] args) { discoverDefaultPrintSer...

A print job is a request of printing something in a specific print service. It consists, basically, by: the data that will be printed (see Building the Doc that will be printed) a set of attributes After picking-up the right print service instance, we can request the creation of a print job...

Sometimes we need to determine some aspects of the print request. We will call them attribute. Are examples of print request attributes: amount of copies (1, 2 etc), orientation (portrait or landscape) chromacity (monochrome, color) quality (draft, normal, high) sides (one-sided, two-sided e...

Bottom up approach for printing the nth Fibonacci number using Dynamic Programming. Recursive Tree fib(5) / \ fib(4) fib(3) / \ / \ fib(3) fib(2...

For example, we can create a ring-shaped cursor fixed to the center of the screen. To fix the cursor to the screen so the cursor is always present no matter where we look, we place it as a child of the active camera entity. We pull it in front of the camera by placing it on the negative Z axis. When...

Also known as gaze-based cursor. If we set the cursor to be fuse-based, the cursor will trigger a click if the user gazes at an entity for a set amount of time. Imagine a laser strapped to the user’s head, and the laser extends out into the scene. If the user stares at an entity long enough (i.e., t...

The cursor builds on top of and depends on the raycaster component. If we want to customize the raycasting pieces of the cursor, we can do by changing the raycaster component properties. Say we want set a max distance, check for intersections less frequently, and set which objects are clickable: &l...

To add visual feedback to the cursor to show when the cursor is clicking or fusing, we can use the animation system. When the cursor intersects the entity, it will emit an event, and the animation system will pick up event with the begin attribute: <a-entity cursor="fuse: true; fuseTimeout:...

Adding 3DoF Controllers Controllers with 3 degrees of freedom (3DoF) are limited to rotational tracking. 3DoF controllers have no positional tracking meaning we can’t reach out nor move our hand back-and-forth or up-and-down. Having a controller with only 3DoF is like having a hand and wrist withou...

A camera situated at the average height of human eye level (1.6 meters or 1.75 yard or 5.25 feet). <a-entity camera="userHeight: 1.6" look-controls></a-entity>

To fix entities onto the camera such that they stay within view no matter where the user looks, you can attach those entities as a child of the camera. Use cases might be a heads-up display (HUD). <a-entity camera look-controls> <a-entity geometry="primitive: plane; height: 0.2; wi...

$logger = $container->get('logger'); This will fetch the service with the service ID "logger" from the container, an object that implements Psr\Log\LoggerInterface.