so I want to rewrite this code from an arrow function to a non arrow function, how will this then be done and what will the code be?
require('isomorphic-fetch');
let items = [];
fetch("https://www.googleapis.com/books/v1/volumes?q=isbn:0747532699")
  .then(res => res.json())
  .then((result) => {
    items = result.items;
    console.log(items);
  }),
  (error) => {
    console.log(error);
  } 
    