October 2019

Nowadays, the most used method of interacting with a Web server is that of the client/server architecture based on Web technology. The process of exchanging information used in Web technology does not differ from the process implemented by the standard client/server architecture, in which the server program manages the processing of the queries received from the client programs.

In the process of information exchange used by web technologies, client programs are executed in web browsing programs, which are usually found on workstations as auxiliary applications, as clients.

Web browsers are used for immediate viewing and interpretation of web documents stored on… read more +

ActiveX is a set of technologies from Microsoft that focuses on integrating and unifying the methods of representing and processing information from computer networks, built in accordance with the web architecture. The main idea of ​​ActiveX technology consists of the identical means of accessing information from the network, in which web technology was selected as the basis for unifying these means of access.

According to the ActiveX philosophy, the web browser should become an integral part of the operating system. Moreover, the methods of obtaining access to any information from the computer, from the local server, from the local network… read more +

Chimera – a demonstrative visual programming by demonstration.

Chimera is an example of how imperative programming is supported in LPVs by having the programmer demonstrate his or her desired actions.

D.J. Kurlander designed the system in his doctoral thesis.

In the case of Chimera, the “programmer” is an end-user, as a result, it is also an example of LPV intended to improve the accessibility level of certain programming types of tasks.

The Chimera domain is graphic editing. As an end-user is working on a graphic scene, he or she may notice repetitive editing tasks, in which case he… read more +

Cocoa (initially called KidSim) is a rules-based LPV, in which the programmer specifies rules for demonstrating a postcondition starting from a precondition. The “programmers” targeted are children, and the associated field is the specification of graphics simulations and games. Cocoa is a complete Turing language, except that its facilities were not designed for general-purpose programming, but to facilitate children’s access to programming their own simulations.

The way in which the concrete and direct attributes are achieved in Cocoa are similar to Chimera because both use demonstration as a way to specify semantics. However, the response time level… read more +

Forms / 3 – Forms / 3 is an example of LPV based on the spreadsheet paradigm, implemented by Margaret Burnett in 1991, as a prototype of her dissertation work.

In this case, the programmer realizes his program by creating a form and specifying its content.

This paradigm is commonly used in commercial spreadsheets, where the form is in the form of a marked grid, and the content is specified by the cell formulas.

Forms / 3 programs include formulas (spreadsheets) with cells, except that the cells are not embedded in a grid. A Forms / 3 programmer… read more +

Android is a software platform and operating system for digital devices and mobile phones, initially developed by Google, and later by the Open Handset Alliance business consortium.

Android allows developers to write managed code in Java, controlling the device through Google’s Java libraries.

Applications are written in C and other languages ​and can be compiled into ARM machine code and executed, but this development model is not officially supported by Google.

In July 2005, Google acquired Android Inc., a startup company headquartered in Palo Alto, California, USA. The co-founders of Android, who continued to work at Google, were… read more +

Google App Inventor is a visual programming language initiated by Google and taken over by MIT in 2012. It is designed for ordinary users without special programming knowledge and allows the creation of applications for the Android operating system.

In order to interact with the user in the simplest way, the program has been visually designed: to create an application, and the user visually draws how the application will look and uses blocks to specify the behavior of its application.

App Inventor uses a graphical interface, much like the user interface of Scratch and StarLogo TNG, which allows… read more +

Now that we’ve gone through some examples of JavaScript let’s add a few features to our site, for example, to see what’s possible. In this section, we will add an additional image to our site using some features of the DOM API, using JavaScript to switch between the two when the image is clicked.

1. First, find another image that you want to add to your site. Make sure it is the same size as the first image, or as close as possible.
2. Save this image to your images directory.
3. Rename this image to “photo2.png” (without the quotes).
4. Go to… read more +

Let us explain some of the basic features of JavaScript to give you a better understanding of how it all works. It is worth mentioning that these features are common to all programming languages, so if you master these fundamentals, you will be on the way to programming almost anything!

1. Variables
Variables are containers in which you can store values. Start by declaring a variable using the keyword lime, followed by any name:
var myVariable;

A semicolon at the end of a line indicates where a statement ends; it is necessary when you have to separate statements on a single line. However,… read more +

JavaScript itself is quite compact but still very flexible. Developers have written a wide variety of tools based on JavaScript, unlocking a large amount of additional functionality with minimal effort.

These include:
– Programming interfaces for browser applications (APIs) – APIs built into web browsers, offering features such as dynamic HTML creation and CSS style setting, collecting and manipulating a video stream from the user’s video camera, or generating 3D graphics and images.
– Third-party APIs to allow developers to integrate functionality into their sites from other content providers, such as Twitter or Facebook.
– Third-party frameworks and libraries that you can include… read more +