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Lua itself offers no class system. It is, however possible to implement classes and objects as tables with just a few tricks. function <class>.new() return setmetatable({}, {__index=<class>}) end

In order to utilize a JDBC datasource, we must first set up a JNDI reference in Tomcat. After the JNDI reference is made, JDBC datasources can be used within our Tomcat server and applications using shared or independent references (Great for dev/staging/prod setup, or removing connection strings/cr...

Firebase database is a NoSQL database that stores its data in the form of hierarchal JSON objects. There are no tables or records of any form as an SQL database would normally have, just nodes that make up a key-value structure. Data Normalization In order to have a properly designed database stru...

If you use the objects in other applications as part of your Visual Basic application, you may want to establish a reference to the object libraries of those applications. This Documentation provides a list, sources and examples of how to use libraries of different softwares, like Windows Shell, Int...

Code that compiles can still run into errors, at run-time. This topic lists the most common ones, their causes, and how to avoid them.

Groovy's HTTP Client usage, examples and pitfalls.

A stack trace is a great aid when debugging a program. You will get a stack trace when your program throws an Exception, and sometimes when the program terminates abnormally.

This section provides an overview of what django-forms is, and why a developer might want to use it. It should also mention any large subjects within django-forms, and link out to the related topics. Since the Documentation for django-forms is new, you may need to create initial versions of tho...

This section provides an overview of what flexbox is, and why a developer might want to use it. It should also mention any large subjects within flexbox, and link out to the related topics. Since the Documentation for flexbox is new, you may need to create initial versions of those related topi...

Django ModelForm enables the creation of a Form class from a Django model.

Django is shipped with several views that require forms. These forms are, naturally, built-in. A good example are Authentication Built-in forms. This topic intends to bring documentation on how to work with these forms.

One core feature of Django is unit tests. This topic intends to bring a complete documentation on how to test forms.

This is a simple example demonstrating how to create a drop down menu in the Active Sheet of your workbook by inserting a Combo Box Activex object in the sheet. You'll be able to insert one of five Jimi Hendrix songs in any activated cell of the sheet and be able to clear it, accordingly.

This section provides an overview of what jq is, and why a developer might want to use it. It should also mention any large subjects within jq, and link out to the related topics. Since the Documentation for jq is new, you may need to create initial versions of those related topics.

Scrollbars can be added to Listbox, Canvas, and Text widgets. In addition, Entry widgets can be scrolled horizontally. To be able to scroll other type of widgets, you need to put them inside a Canvas or a Text widget. scrollbar = tk.Scrollbar(parent, **kwargs) ParameterDescriptionparentt...

Collection of commands to fetch system related information.

Here you find examples for transition between Activities or Fragments using a shared element. An example for this behaviour is the Google Play Store App which translates an App's icon from the list to the App's details view. transaction.addSharedElement(sharedElementView, "targetTransitio...

OpenCV Installation On Linux, Mac OS and Windows

A Canvas is a JavaFX Node, represented as a blank, rectangular area, that can display images, shapes and text. Each Canvas contains exactly one GraphicsContext object, responsible for receiving and buffering the draw calls, which, at the end, are rendered on the screen by Canvas.

grep, egrep, fgrep, rgrep, pgrep - are commands in Unix-like operating systems that print lines matching a pattern. The grep searches the named input FILEs for lines containing a match to the given PATTERN. By default, it prints the matching lines. In addition, the variant programs egrep, fgr...