Skip to main content

What is ReactJS?

React creates a virtual DOM. When the state changes in a component, it first runs a "diffing" algorithm, which identifies what has changed in the virtual DOM. The second step is reconciliation, where it updates the DOM with the results of diff.

What are the advantages of using React?​

High performance: React updates only those components that have changed, rather than updating all the components at once. This results in much faster web applications.

  • It is easy to know how a component is rendered, you just need to look at the render function.
  • JSX makes it easy to read the code of your components. It is also really easy to see the layout, or how components are plugged/combined.
  • You can render React on the server side. This improves SEO and performance.
  • Easy to write unit and integration tests with tools such as Jest.
  • You can use React with any framework you wish as it is only a view layer.