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React attacks us with the virtual DOM right away, on the main page. This feature seems to be very important! But what does “virtual DOM” mean exactly? DOM Just to get things straight - DOM stands for Document Object Model and is an abstraction of a structured text. For web developers, this text is an HTML code, and the DOM is simply called HTML DOM. Elements of HTML become nodes in the DOM. So, wh

Dynamic user interfaces began to be an important feature for today web applications. To maintain quality, they must be tested properly. There are variety of approaches - each has its pros and cons. As a React developer you may need to choose a proper approach to test your components in an effective way. Two axes of testing components When you test React components, there are at least two concerns

A lot of developers coming to JavaScript world attracted by React.js are confused with the tooling used to produce modern JavaScript code. Webpack, Babel, ESLint, Mocha, Karma, Grunt… what should I use and which tool is doing what? JavaScript newcomers are often people coming from communities like Ruby and Java where opinionated, full-stack solutions exist. Frameworks like Ruby on Rails provide a