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Series are the core of how Rebol works and as such understanding how to manipulate series is fundamental in mastering the language. There are two series subtypes—blocks and strings: both share essential common traits with regard to traversal, alteration and extraction, though all series have subtle ...

iOS, watchOS and tvOS Simulators are great ways to test your apps without using an actual device. Here we will talk about working with Simulators. Different Types of Simulators iOS Simulator watchOS Simulator tvOS Simulator Touch Bar Simulator There is no simulator for macOS, beca...

Being responsive is a need for every app. Users want to have apps which have their content ready when they open it, so developers should use Background Modes to make their apps more user friendly.

This document will show you how to call Scala jobs from a pyspark application. This approach can be useful when the Python API is missing some existing features from the Scala API or even to cope with performance issues using python. In some use cases, using Python is inevitable e.g you are buildi...

Properties are key-value-pairs where Apache Ant tries to expand ${key} to value at runtime. Ant properties are very helpful if you have to do a lot to processing to create installables or do custom deployments etc. For example, you can mark ${src.dir} as source code directory,${lib.dir} as library...

This module provides the ConfigParser class which implements a basic configuration language in INI files. You can use this to write Python programs which can be customized by end users easily. Each new line contains a new key value pair separated by the = sign Keys can be separated in section...

Yii2 has some built-in validators which can be used while solving programming related or general puprose validations. When you need to create a new business logic validation you need to create your own validators.

Jumbotron is a standard component of Bootstrap to display some important contents on your website. It is usually used right under the navbar, before the content. Inside the jumbotron, all grid system, container class and row class also works.

This function is to add an item in the admin panel's nav bar. add_menu_page( $page_title, $menu_title, $capability, $menu_slug, $function, $icon_url, $position) ParameterDetails$page_title(string) The text to be displayed in the title tags of the page when the menu is selected.$menu_titl...

This function is to add a sub-item to an existing item in the admin panels nav bar. add_submenu_page( $parent_slug, $page_title, $menu_title, $capability, $menu_slug, $function ) ParameterDetails$parent_slug(string) The slug name for the parent menu (or the file name of a standard WordPr...

Retrieves an option value based on an option name. get_option( $option, $default ) ParameterDetails$option(string) Name of option to retrieve. Expected to not be SQL-escaped.$default(mixed) (Optional) Default value to return if the option does not exist. List of arguments for $option ...

tidyr has two tools for reshaping data: gather (wide to long) and spread (long to wide). See Reshaping data for other options.

Whenever you work with video feeds you may eventually want to save your image processing result in a form of a new video file. For simple video outputs you can use the OpenCV built-in VideoWriter class, designed for this. It is useful to look at some concepts before using them. These concepts are co...

Composite lets clients treat individual objects and compositions of objects uniformly. For example consider a program that manipulates a file system. Files are simple objects and folders are composition of files and folders. However, for example, they both have size, name etc. functions. It would be...

Sections are a feature that allow store owners to add, edit, remove and easily reorder content on a page. There are 2 types of sections: dynamic and fixed. Dynamic sections are able to be reordered in their entirety with other sections on the page (homepage). Fixed sections cannot be reordered, but ...