Stateless vs stateful components

Before diving into Redux, let's do a brief recap of the differences between a stateless component and a stateful component:

• The CodeEditor is a stateless component written as a function. A stateless component can also be written as a class: that's what we did first when we write the CodeListEditor class without calling setState. If a component is stateless, its appearance and behavior are fully determined by the initial props it is given.
• The final CodeListEditor component is a stateful component: we wrote it as a class, we initialized the state within the constructor, and we defined some methods which use the setState method to update the state and trigger a re-rendering of the component.