I’ve been working with React a bit lately and wanted to document my experience and findings. Since there’s quite a few “hello world”/getting started guides out there already, I’ll provide links to those and cover key points I took away from articles and experience.
When React was announced around mid-2013, it looked like an interesting concept and seemed like it should be pretty significant considering it was being maintained by Facebook. However, it fell off my radar soon after. as It was too early to use in any of my projects. Looking at where React stands now in addition to supporting libraries, I can see that the scene has matured and stabilized quite a bit.
What is React?
Because of this separation, React can fit into other frameworks or be pieced together with other libraries to make a complete MV*C framework, such as Flux (see which Flux implementation should I use on history/development of Flux), Redux, or Cerebral.
React is designed to be scalable and fast. Some patterns like its root level event listener are intended to make React fast, and other features, such as the virtual DOM, use encapsulation to reduce or eliminate common problems with scaled web applications caused by conflicting class/ID names and DOM manipulation side effects.
Also worth noting, React was split into react-dom and react-native to independently support browser and mobile apps. For this article, I’ll be covering what is referred to as react-dom, which is React for the browser.
The challenges with React more lie in the ecosystem, when third-party libraries and the build process come into play. However, the libraries are worth getting familiar with, and the build process should become less confusing as things settle down. For now, there are plenty of boilerplate start projects on github.
The first step is to take it easy and not get overwhelmed. There are a collection of technologies that make a React stack, and they don’t have to be learned at once, I recommend first focusing on React and JSX first. By understanding the core concepts and working with plain React is a good start.
React’s homepage goes over the fundamentals of building a React app from scratch without diving too far into the tool chain. A starter kit can be downloaded from their getting started guide.
The following is a simple “Hello World” component defined with a pure function. For components that don’t hold state (covered further down), pure functions are preferred over react factories, such as React.createClass or React.createComponent.
See the Pen React Hello World by Justin Osterholt (@hattraz) on CodePen.0