UseReducer initialization

Question

 function Init(){
    var form={};
    axios.get(`http://localhost:3001/exercises/${ex_id}`)
    .then(res => form={...res.data })
    .catch(err => console.log(err));
    console.log(form)
    return{form}
  }
  //console.log(form)

  const [state,dispatch] = useReducer(reducer,null,Init);

the state is not initialized. Can anybody help fix the error?