Tutorial by Examples: r

You can group all your custom functions/filters/tests/... inside a custom Twig_Extension class: ProjectTwigExtension class ProjectTwigExtension extends Twig_Extension { public function getFunctions() { return array( new Twig_SimpleFunction('twig_function_name', array($...

OneGet was originally a product from the Open Source Technology Center at Microsoft. Not only is it inspired by open-source Linux package managers, OneGet itself is also open source. It's now part of PowerShell As opposed to Unix based package managers (such as apt-get, yum, or dpkg), Windows allow...

Atomic variables can be accessed concurrently between different threads without creating race conditions. /* a global static variable that is visible by all threads */ static unsigned _Atomic active = ATOMIC_VAR_INIT(0); int myThread(void* a) { ++active; // increment active race fr...

Here is a workaround to temporary reset your password for your account. Login to your hosting panel and use the database tool that is available (probably PHPmyAdmin). Load the appropriate database and then go to the jos_users table. (The database prefix might be different for your case). ...

Creation To create a Custom Setting, go to: Classic Setup > Develop > Custom Settings > New Lightning Setup > Custom Code > Custom Settings > New Create your setting (see the Remarks later in this document for the differences between Hierarchy & List custom settings). You...

Custom Setting Custom Setting Field Custom Setting Field Value When the field is checked the validation rule will be disabled, for the running user or in this example, their profile - The rule can also be disabled for a whole Salesforce org - Validation Rule AND( /* the below is the...

Explanation In this example a simple Trigger has been created to change the Close Date of an Opportunity, that's about to be inserted or updated, to a date 10 days in the future. The Apex Controller custom setting's checkbox field enables the code to be disabled at the user / profile / org level. ...

To obtain an instance of an HTTP Request, class Illuminate\Http\Request need to be type hint either in the constructor or the method of the controller. Example code: <?php namespace App\Http\Controllers; /* Here how we illuminate the request class in controller */ use Illuminate\Http\Re...

Sometimes we need to accept route params as well as access the HTTP Request params. We can still type hint the Requests class in laravel controller and achieve that as explained below E.g. We have a route that update a certain post like this (passing post id i route ) Route::put('post/{id}', 'Post...

import xlsxwriter # sample data chart_data = [ {'name': 'Lorem', 'value': 23}, {'name': 'Ipsum', 'value': 48}, {'name': 'Dolor', 'value': 15}, {'name': 'Sit', 'value': 8}, {'name': 'Amet', 'value': 32} ] # excel file path xls_file = 'chart.xlsx' # the workbook w...

XML Data can be written as is in XQuery and will be found in the output. The following code can be considered valid XQuery : <application> <id>MyApp</id> <name>My Application</name> <version>1.0</version> </application> Note that your XQ...

To address data from an XML input, XQuery uses XPath. It makes it easy to filter data and restructure it. Given the following XML input <?xml version="1.0" encoding="UTF-8"?> <applications> <application> <id>MyApp</id> <name>My...

Each signed integer type may be represented in any one of three formats; it is implementation-defined which one is used. The implementation in use for any given signed integer type at least as wide as int can be determined at runtime from the two lowest-order bits of the representation of value -1 ...

Resolving scoped services during application startup can be difficult, because there is no request and hence no scoped service. Resolving a scoped service during application startup via app.ApplicationServices.GetService<AppDbContext>() can cause issues, because it will be created in the sc...

Visual Studio 2013 can be downloaded here The setup is pretty easy.Select features you need and select the disk to install VS13 on.Click install and wait for it to finish.

Various websites provide online access to C++ compilers. Online compiler's feature set vary significantly from site to site, but usually they allow to do the following: Paste your code into a web form in the browser. Select some compiler options and compile the code. Collect compiler and/or pro...

Stream iterators are useful when we need to read a sequence or print formatted data from a container: // Data stream. Any number of various whitespace characters will be OK. std::istringstream istr("1\t 2 3 4"); std::vector<int> v; // Constructing stream iterators and copyi...

from bs4 import BeautifulSoup import requests # Use the requests module to obtain a page res = requests.get('https://www.codechef.com/problems/easy') # Create a BeautifulSoup object page = BeautifulSoup(res.text, 'lxml') # the text field contains the source of the page # Now use a CSS ...

A defer statement consists of a block of code, which will be executed when a function returns and should be used for cleanup. As Swift's guard statements encourage a style of early return, many possible paths for a return may exist. A defer statement provides cleanup code, which then does not need ...

When using a defer-statement, make sure the code remains readable and the execution order remains clear. For example, the following use of the defer-statement makes the execution order and the function of the code hard to comprehend. postfix func ++ (inout value: Int) -> Int { defer { value...