Tutorial by Examples: ga

Creating a new project from the Game template.

To set up a default SceneKit project you can use the Game Template.

scenekit • Getting started with scenekit

Investigate Directories For Disk Usage

Sometimes it may be required to find out which directory consuming how much disk space especially when you are used df -h and realized your available disk space is low. du: du command summarizes disk usage of the set of FILEs, recursively for directories. It's often uses with -sh option: -s, --s...

GNU/Linux • Check Disk Space

Using a behaviour

Add a -behaviour directive to your module to indicate that it follows a behaviour: -behaviour(gen_server). The American spelling is also accepted: -behavior(gen_server). Now the compiler will give a warning if you've forgotten to implement and export any of the functions required by the beha...

Erlang Language • Behaviours

Defining a behaviour

You can define your own behaviour by adding -callback directives in your module. For example, if modules implementing your behaviour need to have a foo function that takes an integer and returns an atom: -module(my_behaviour). -callback foo(integer()) -> atom(). If you use this behaviour in...

Erlang Language • Behaviours

Happens-before reasoning applied to some examples

We will present some examples to show how to apply happens-before reasoning to check that writes are visible to subsequent reads. Single-threaded code As you would expect, writes are always visible to subsequent reads in a single-threaded program. public class SingleThreadExample { public in...

Java Language • Java Memory Model

Using Associated Constants

// Must enable the feature to use associated constants #![feature(associated_consts)] use std::mem; // Associated constants can be used to add constant attributes to types trait Foo { const ID: i32; } // All implementations of Foo must define associated constants // unless a defaul...

Rust • Associated Constants

Building and running the module

In order to compile the driver, it is necessary to have the Linux Kernel source tree. Assuming the sources are at /lib/modules/<kernel-version>, the following Makefile will compile the file driver.c into the driver.ko Kernel Object obj-m := driver.o KDIR := /lib/modules/$(shell uname -r)/bu...

linux-kernel • Linux Hello World Device driver

Customize default navigation bar appearance.

// Default UINavigationBar appearance throughout the app [[UINavigationBar appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor whiteColor], NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue-CondensedBold...

iOS • Navigation Bar

Building and installing software

If you have found your software in the ports tree, now its the time to build it. Simple build and install with manual configuration cd /usr/ports/www/apache24 make make install Simple build and install with automatic configuration cd /usr/ports/www/apache24 make BATCH=yes make install ...

FreeBSD • Packages and Ports management

Networking and Jails

FreeBSD jails can have fine grained networking configuration. By default, every jails use the same network configuration than host. Removing network support jail -c name="nonetwork" path="/path/to/your/jail" ip4=disable ip6=disable Allowing only IPv4 networking jail -c name...

FreeBSD • FreeBSD Jails

Open camara and photo gallery

index.html <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta http-equiv="Content-Security-Policy" content="default-src *; script-src 'self' 'unsafe-inline' 'unsafe-eval' *; style-src 'self' 'unsafe-inline' *"/> ...

ionic-framework • Device camera and photo library access from Ionic application

Defining an enumerated type

An enumerated type is a type that can hold one of a finite list of possible values. In Julia, enumerated types are typically called "enum types". For instance, one could use enum types to describe the seven days of the week, the twelve months of the year, the four suits of a standard 52-ca...

Julia Language • Enums

Finding all instances of an entity class

All instances (objects) of an entity class can be loaded from the underlying database table as follows (akin to retrieving all rows from the table): Iterable<Foo> foos = fooRepository.findAll(); The findAll method is provided by the CrudRepository interface. It returns an Iterable instead ...

spring-data-jpa • Repositories

Finding a particular instance of an entity class by the identifier

A particular instance of an entity class can be loaded as follows: Foo foo = fooRepository.findOne(id); The findOne method is provided by the CrudRepository interface. It expects an identifier that uniquely identifies an entity instance (for instance, a primary key in a database table). The Java...

spring-data-jpa • Repositories

Finding all instances of an entity class with an attribute matching a specified value

All instances of an entity class with one of the class attributes matching a specified value can be retrieved as follows: public interface FooRepository extends CrudRepository<Foo, Long> { List<Foo> findAllByName(String name); } Invoking the findAllByName method results in the JP...

spring-data-jpa • Repositories

Minimal: Log a message on Before Load

// 1.0 function beforeLoad(type, form, request) { nlapiLogExecution("DEBUG", "Before Load", "type=" + type); } // 2.0 /** * @NApiVersion 2.x * @NScriptType UserEventScript * @NModuleScope SameAccount */ define(["N/log"], function (log) { ...

netsuite • User Event: Before Load event

Loading a Webpage

var page = require('webpage').create(); page.open('http://www.google.com', function(status) { console.log("Status: " + status); var title = page.evaluate(function() { return document.title; }); console.log("Loaded page: " + title); phantom.exit(); });

phantomjs • Getting started with phantomjs

Creating an observer

Observers are used for listening to livecycle callbacks of a certain model in Laravel. These listeners may listen to any of the following actions: creating created updating updated saving saved deleting deleted restoring restored Here is an example of an observer. UserObserver &l...

Laravel • Observer

Split Screen introduced in Android Nougat implemented.

Set this attribute in your manifest's or element to enable or disable multi-window display: android:resizeableActivity=["true" | "false"] If this attribute is set to true, the activity can be launched in split-screen and freeform modes. If the attribute is set to false, the...

Android • Split Screen / Multi-Screen Activities

Navigating to a directory on a different drive

cd by itself will not allow a user to move between drives. To move to a different drive, the /d option must be specified. e.g. Moving from C:\Users\jdoe\Desktop to D:\Office Work cd /d "D:\Office Work"

batch-file • Changing Directories and Listing their Contents