Tutorial by Topics: o

Management commands are powerful and flexible scripts that can perform actions on your Django project or the underlying database. In addition to various default commands, it's possible to write your own! Compared to regular Python scripts, using the management command framework means that some tedi...

Design patterns are a good way to keep your code readable and DRY. DRY stands for don't repeat yourself. Below you could find more examples about the most important design patterns. In software engineering, a software design pattern is a general reusable solution to a commonly occurring proble...

To install package simply run: install.packages("stringi") to load it: require("stringi")

A function is basically a named block of code. When you call the function name, the script block within that function runs. It is a list of PowerShell statements that has a name that you assign. When you run a function, you type the function name.It is a method of saving time when tackling repetitiv...

Serial.begin(speed) // Opens the serial port on the given baud rate Serial.begin(speed, config) Serial[1-3].begin(speed) // Arduino Mega only! When writing 1-3 it means you can choose between the numbers 1 to 3 when choosing the serial port. Serial[1-3].begin(speed, config) // Arduino Mega onl...

The std::sort function family is found in the algorithm library.

Android has a dedicated XML namespace intended for tools to be able to record information in XML file. The namespace URI is : http://schemas.android.com/tools and is usually bound to the tools: prefix.

Parallelization on remote machines require libraries to be downloaded on each machine. Prefer package::function() calls. Several packages have parallelization natively built-in, including caret, pls and plyr. Microsoft R Open (Revolution R) also uses multi-threaded BLAS/LAPACK libraries which int...

This extension filters data by either validating or sanitizing it. This is especially useful when the data source contains unknown (or foreign) data, like user supplied input. For example, this data may come from an HTML form. mixed filter_var ( mixed $variable [, int $filter = FILTER_DEFAULT ...

Regular Expressions (sometimes called regexs or regexps) are a textual syntax which represents the patterns which can be matched in the strings operated upon. Regular Expressions, introduced in c++11, may optionally support a return array of matched strings or another textual syntax defining how to...

insert(document or array of documents) insertOne( 'document', { writeConcern: 'document' } ) insertMany( { [ document 1 , document 2, ... ] }, { writeConcern: document, ordered: boolean } ) find(query, projection) findOne(query, projection) update(query, update) updateOne( query,...

An operator is something that takes one or more values (or expressions, in programming jargon) and yields another value (so that the construction itself becomes an expression). Operators can be grouped according to the number of values they take. Operators 'operate' or act on one (unary opera...

define ( string $name , mixed $value [, bool $case_insensitive = false ] ) const CONSTANT_NAME = VALUE; Constants are used to store the values that are not supposed to be changed later. They also are often used to store the configuration parameters especially those which define the environ...

from django.contrib.postgres.fields import ArrayField class ArrayField(base_field, size=None, **options) FooModel.objects.filter(array_field_name__contains=[objects, to, check]) FooModel.objects.filter(array_field_name__contained_by=[objects, to, check]) Note that although the size param...

There are some cases where your application cannot manipulate the contents of assets loaded from an external resource (e.g. transform images). I can't remember for certain what they are, but I am fairly sure it's related to cross domain content loading.