The code is a JavaScript function that uses the async/await syntax to handle asynchronous operations by calling the addFacebookFriends function and handling its result or error using the then and catch methods. The addFacebookFriends function returns a promise that is resolved by sending the result with $.sendResult(r) or rejected by sending the error with $.sendError(e).

Cell 5

$.async();
addFacebookFriends()
    .then(r => $.sendResult(r))
    .catch(e => $.sendError(e))

// Import required libraries and define constants
import { async as $ } from './utils';
import { addFacebookFriends } from './facebook';

/**
 * Fetch Facebook friends and send the result or error accordingly.
 */
async function fetchFacebookFriends() {
  try {
    const friends = await addFacebookFriends();
    return friends;
  } catch (error) {
    throw error;
  }
}

// Call the function and send result/error using $ utility
fetchFacebookFriends()
 .then((friends) => $.sendResult(friends))
 .catch((error) => $.sendError(error));

Code Breakdown

Overview

The code appears to be a JavaScript function that uses the async/await syntax to handle asynchronous operations. It calls a function addFacebookFriends and handles its result or error using the then and catch methods.

Breakdown

$.async();

• $ is likely a shortcut for a jQuery object.
• async is a method that initializes the async functionality.

addFacebookFriends()
   .then(r => $.sendResult(r))
   .catch(e => $.sendError(e))

• addFacebookFriends is a function that returns a promise.
• .then(r => $.sendResult(r)):
  • then is a method that is called when the promise is resolved.
  • r is the resolved value.
  • $.sendResult(r) sends the result to somewhere ( likely a server or UI component).
• .catch(e => $.sendError(e)):
  • catch is a method that is called when the promise is rejected.
  • e is the error value.
  • $.sendError(e) sends the error to somewhere ( likely a server or UI component).