Wish

gistfile1.txt

// state for entire app set up here
const state = {
  user: {first: '', last: '', age: '', address: '', state: ''}
  otherstuff: []
}

// a component somewhere
const myComponent = () => {
  return (
    <div>
      // short one-liner updates application state with all form values
      <form onSubmit={(e) => {merge('state.user', e.all.values)}}>
        <input name="first" />
        <input name="last" />
        <input name="age" />
        <input name="address" />
        <input name="state" />
        <input type="submit" />
      </form>
    </div>
  )
}