Create a stateful component

class StatefulComponent extends React.Component {
  constructor(props) {
    // Only change code below this line

    // Only change code above this line
  render() {
    return (

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The state goes inside the constructor on this

this.state = {
  someProp: 'somevalue'

It is just a class and pretty much works as any class would.

class someClass {
  constructor() {
    this.instanceProperty = {
      prop: "value"
  renderMethod() {
    return `<div>${this.instanceProperty.prop}</div>`

const instance = new someClass();
console.log(instance.instanceProperty.prop); // value
console.log(instance.renderMethod()); // <div>value</div>