Tech Tips

The development on React js in Eastern Europe

React is the perfect solution for single-page and multi-page applications, same as for the development of the website. For example, the largest and the most popular social networks were created with its help. The library is intended:

  • to create functional interactive web interfaces, working with which you do not need to constantly refresh the page;
  • fast and convenient implementation of individual components and entire pages – elements in React are easy to reuse;
  • easy development of complex program structures – they are easy to describe if you use the approach implemented in React;
  • refinement of new functionality with any original technology stack: the library does not depend on the rest of the toolkit and will work well, no matter what the code is written on;
  • development of single-page and multi-page applications (SPA and PWA). These are applications that function as programs and web services and have an appropriate interface;
  • working with the server part of the site or developing mobile applications. In such cases, React is used in conjunction with tools that adapt web technologies for other purposes.

Features of the React 

  • Declarative

Declarative style of react js development company eastern Europe means that it is enough to describe once how the results of the code will look like – elements in different states. He does not need to focus on how to achieve results: most of the tasks will be performed by the library. React.js will automatically update the elements depending on the conditions, the main task is to correctly describe them. A convenient and understandable approach makes it easier to write and debug code.

  • Virtual DOM Tree

Any web interface is based on an HTML document and CSS styles, to which the JavaScript code is connected. The structure of an HTML document, or rather its model, is called a DOM tree (DOM stands for Document Object Mode, Document Object Model). This is a tree model in which all the elements used on the page are collected in a hierarchical form. The peculiarity of React is that it creates and stores in the cache a virtual DOM tree – a copy of the DOM that changes faster than the real structure. This is necessary in order to quickly update pages. If the user performs an action or an event occurs, the DOM must change as the objects on the page change. But the real object model can be huge, and updating it is a slow process. Therefore, React does not work with it, but with a virtual copy in the cache, which weighs less. When an event occurs that causes code to update an object, the change is quickly reflected in the virtual DOM. After that, the real object model is updated. For the user, this means that changes on the page will be displayed instantly, and not after a long load.

  • Updating the DOM in Pieces

To improve performance, React does not update the entire DOM. It keeps two lightweight copies in memory: the current one and the previous one. When something is updated, the library compares the versions with each other and only changes the part of the tree that actually changed. This is necessary so as not to reload the entire DOM and not slow down the page. The approach seems complicated, but it is important for boot optimization.

  • Ability to reuse components

React is based on components – individual elements of the web interface. Components are encapsulated, that is, they are independent: each of them contains all the necessary methods and data. You can read more about encapsulation in our article on OOP: this is one of the key criteria for an object-oriented approach. In the case of React components, encapsulation also means that the element’s state is stored in itself.

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