component_without_constructor_with_state_function.tsx

interface IProps {
  superhero: string;
}

interface IState {
  health: number;
}

const getInitialHealth = (props: IProps) => props.superhero === "Spiderman" ? 0 : 100;

export class MyComponent extends React.PureComponent<IProps, IState> {
  readonly state = { health: getInitialHealth(this.props) };
  
  render() {
    return <span>{`${this.props.superhero} health is: ${this.state.health}`}</span>
  }
}