Tutorial by Examples: e

Disable directory index

Enabled directory index means that if someone access to any folder which don't contains index.php , index.html, index.htm or any other default file defined in DirectoryIndex in apache configuration then all files in that folder will be listed in browser if you try to visit that page. Often director...

Different Reference Types

java.lang.ref package provides reference-object classes, which support a limited degree of interaction with the garbage collector. Java has four main different reference types. They are: Strong Reference Weak Reference Soft Reference Phantom Reference 1. Strong Reference This is the usual...

Events for repeating elements without using ID's

Problem There is a series of repeating elements in page that you need to know which one an event occurred on to do something with that specific instance. Solution Give all common elements a common class Apply event listener to a class. this inside event handler is the matching selector elemen...

Random number generator's reproducibility

When expecting someone to reproduce an R code that has random elements in it, the set.seed() function becomes very handy. For example, these two lines will always produce different output (because that is the whole point of random number generators): > sample(1:10,5) [1] 6 9 2 7 10 >...

Single Document Interface Versus Multiple Document Interfaces

Be aware that Microsoft Excel 2013 (and higher) uses Single Document Interface (SDI) and that Excel 2010 (And below) uses Multiple Document Interfaces (MDI). This implies that for Excel 2013 (SDI), each workbook in a single instance of Excel contains its own ribbon UI: Conversely for Excel...

Configuring RabbitMQ on *nix Systems

Configuring your environment RabbitMQ looks for an set of environment variables in /etc/rabbitmq/rabbitmq-env.conf. If it does not exist, it assumes default values. All values in rabbitmq-env.conf get exported to the environment the RabbitMQ server runs in with a RABBITMQ_ prefix; this prefix is no...

Passing by reference using ref keyword.

From the documentation : In C#, arguments can be passed to parameters either by value or by reference. Passing by reference enables function members, methods, properties, indexers, operators, and constructors to change the value of the parameters and have that change persist in the calling e...

Installation or Setup

Detailed instructions on getting silverlight set up or installed.

Time Zones and Daylight Savings Time

The DATE data type does not handle time zones or changes in daylight savings time. Either: use the TIMESTAMP WITH TIME ZONE data type; or handle the changes in your application logic. A DATE can be stored as Coordinated Universal Time (UTC) and converted to the current session time zone like...

Leap Seconds

Oracle does not handle leap seconds. See My Oracle Support note 2019397.2 and 730795.1 for more details.

Why Use It?

Option Strict On prevents three things from happening: 1. Implicit Narrowing Conversion Errors It prevents you from assigning to a variable that has less precision or smaller capacity (a narrowing conversion) without an explicit cast. Doing so would result in data loss. Dim d As Double = 123.4 ...

Ordering matters

There is overflow in the following code int x = int.MaxValue; Console.WriteLine(x + x + 1L); //prints -1 Whereas in the following code there is no overflow int x = int.MaxValue; Console.WriteLine(x + 1L + x); //prints 4294967295 This is due to the left-to-right ordering of the operations...

Command line arguments

Command line arguments parsing is Go is very similar to other languages. In you code you just access slice of arguments where first argument will be the name of program itself. Quick example: package main import ( "fmt" "os" ) func main() { progName := o...

Declaration and attributes

Throughout the topics and examples here we'll see many declarations of variables, functions and so on. As well as their name, data objects may have attributes. Covered in this topic are declaration statements like integer, parameter :: single_kind = kind(1.) which gives the object single_kind...

Difference between jQuery(fn) and executing your code before

Using the document-ready event can have small performance drawbacks, with delayed execution of up to ~300ms. Sometimes the same behavior can be achieved by execution of code just before the closing </body> tag: <body> <span id="greeting"></span> world! <sc...

Creating a task

You can create a task (Console Command) in Laravel using Artisan. From your command line: php artisan make:console MyTaskName This creates the file in app/Console/Commands/MyTaskName.php. It will look like this: <?php namespace App\Console\Commands; use Illuminate\Console\Command; c...

Making a task available

You can make a task available to Artisan and to your application in the app/Console/Kernel.php file. The Kernel class contains an array named $commands which make your commands available to your application. Add your command to this array, in order to make it available to Artisan and your applicat...

Scheduling your task

When your command is made available to your application, you can use Laravel to schedule it to run at pre-defined intervals, just like you would a CRON. In The app/Console/Kernel.php file you will find a schedule method that you can use to schedule your task. <?php namespace App\Console; ...

Setting the scheduler to run

The scheduler can be run using the command: php artisan schedule:run The scheduler needs to be run every minute in order to work correctly. You can set this up by creating a cron job with the following line, which runs the scheduler every minute in the background. * * * * * php /path/to/artisan...

Installation or Setup

Detailed instructions on getting LabVIEW set up or installed.

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