React

Conditional rendering is really what React is all about - Each component reacts to the state updating and as a result, we as developers want to render certain elements to the DOM based on these state changes. Enter conditional rendering.

Data cleanup is an important aspect to keep in mind whenever building a front end application using React. Often times we as developers need to set an interval in which a certain function runs. What happens once the component is unmounted? It's critical that this interval be removed in order for the application to remain performant and not waste resources.