ELearn World - Learn the Tutorials online

In one of my previous articles I wrote about Erlang Term Storage tables (or simply ETS), which allow tuples of arbitrary data to be stored in memory. We also discussed disk-based ETS (DETS), which provide slightly more limited functionality, but allow you to save your contents to a file. Sometimes, however, you may require an even more powerful solution to store the data. Meet Mnesia —a real-time distributed database management system initially introduced in Erlang. Mnesia has a relational/object hybrid data model and has lots of nice features, including replication and fast data searches. In this article, you will learn: How to create a Mnesia schema and start the whole system. What table types are available and how to create them. How to perform CRUD operations and what the difference is between "dirty" and "transactional" functions. How to modify tables and add secondary indexes. How to use the Amnesia package to simplify working with databases and table

In my  previous article about secure coding in Swift , I discussed basic security vulnerabilities in Swift such as injection attacks. While injection attacks are common, there are other ways your app can be compromised. A common but sometimes-overlooked kind of vulnerability is race conditions.  Swift 4 introduces Exclusive Access to Memory , which consists of a set of rules to prevent the same area of memory being accessed at the same time. For example, the inout argument in Swift tells a method that it can change the value of the parameter inside the method. func changeMe(_ x : inout MyObject, andChange y : inout MyObject) But what happens if we pass in the same variable to change at the same time? changeMe(&myObject, andChange:&myObject) // ??? Swift 4 has made improvements that prevent this from compiling. But while Swift can find these obvious scenarios at compile time, it is difficult, especially for performance reasons, to find memory access problems in concurren

Today, we’re going to explore how you can manage multiple applications in the CodeIgniter web framework using a single codebase. In the course of that, we’ll go ahead and create two different CodeIgniter applications that will share the core CodeIgniter codebase. Sharing the core codebase across different applications is not something new as it’s already practiced by different frameworks and open-source systems, and CodeIgniter is no different. It easily allows you to manage multiple applications that share the core CodeIgniter library and API files, and at the same time you could use different databases and site-specific configurations. To start with, we’ll go through the benefits of the multisite setup, and as we move on we’ll go through a practical demonstration of what it takes to set up multiple applications in the CodeIgniter framework. Benefits of the Multisite Setup In this section, we’ll highlight a couple of benefits of having a multisite setup. One of the most obvious b

So far in this series, you have learned how to animate the CSS properties of different elements, how to create different SVG-related animations , and how to animate the text content of different elements on a webpage. There is one more way in which you can animate the elements on a webpage using KUTE.js, and that is by changing the values of different attributes. This requires you to include the attributes plugin in your project. In this tutorial, you will learn how to use the attributes plugin to animate the value of different kinds of attributes in KUTE.js. We will also discuss different easing functions that you can use to control the pace of different animations. Easing Functions Objects in real life very rarely move linearly. They are either accelerating or decelerating. Even the acceleration and deceleration occur at different magnitudes. Up to this point, all our animations have progressed linearly. This doesn't feel natural at all. In this section, you will learn abou

In the second tutorial of this series, you learned how to animate different CSS properties of the elements on a webpage using KUTE.js. You learned how to animate all the transform properties as well as properties like border-radius and border-color . You can also use the CSS plugin to animate CSS properties like font-size , line-height , letter-spacing , and word-spacing . KUTE.js also has a Text plugin which allows you to animate the text inside different elements, either by increasing or decreasing a number like in a countdown or by writing a string character by character. In this tutorial, you will learn how to animate the text inside different elements on a webpage using the CSS and Text plugins in KUTE.js. Animating CSS Text Properties As I mentioned earlier, you can use the KUTE.js CSS plugin to animate four different text-related CSS properties. These properties are  font-size , line-height , letter-spacing , and word-spacing . We will also use some properties from the cor

The previous tutorial of the series showed you how to animate different CSS properties of any element using KUTE.js. However, the core engine does not allow you to animate properties that are specific to SVG elements. Similarly, you can't animate the SVG morphing of different path shapes or the drawing of different SVG elements using strokes. You will have to use the KUTE.js SVG plugin to achieve any of these tasks. Before we begin, keep in mind that you will have to include both the KUTE.js core engine and the SVG plugin for the examples in this tutorial to work. Morphing SVG Shapes Morphing one SVG shape into another is a very common feature that you will come across. The KUTE.js SVG plugin gives us everything that we need to create our own morphing animations with ease.  There are three ways to morph SVG shapes using this library: You can use the fromTo() method to specify both the initial and the final SVG path for your element.  You can also use the to() method and