React Stateful Components without classes

React supports this since version 16.8. From the documentation:

Hooks are a new addition in React 16.8. They let you use state and other React features without writing a class.

A simple example:

import { useState } from 'react';

function Example() {
  // Declare a new state variable, which we'll call "count"
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

For an example of how to use lifecycles, check out useEffect

Writing Stateful component without using classes is definitely a choice made by several developers. I recommend to use 'recompose' which has nice and easy implementation to write stateful components without class, yet apply state, both local and from store. Here is an example:

import compose from 'recompose/compose'
import withState from 'recompose/withState'
import withProps from 'recompose/withProps'

Pure.js

function MyComponent(props) ({

  local: { prop1, prop2 },
  setProp1 
})

  return <div>{prop1}</div>
}

const defaultState = {
  prop1: false,
  prop2: false
}

const enhance = compose(
  withState('local', 'updateLocal', defaultState),
  withProps(({ local: { prop1, prop2 }, updateLocal }) => ({
    setProp1: (newValue) => updateLocal(state => ({...state, prop1: newValue }))
  })))

export default enhance(MyComponent)