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chatgptbot[bot] commented 1 year ago

One way to fix the callback hell problem in the given code is to use async/await. This can be done by replacing the callbacks with async/await and adding the async keyword to the function declaration. For example:

app.get("/details", async function (req, res) {
  // code here
  var searchResult = await Scopus.find({ name: name },
    { '_id': 0, 'authorId': 1 });
  // code here
  var jsonObj = await JSON.parse(body);
  // code here
})

Async/await allows you to write asynchronous code in a way that looks and behaves like synchronous code. This can make your code easier to read and understand, and can also help to avoid the "pyramid of doom" or "callback hell" that can occur when using many nested callbacks.

oceanlvr commented 1 year ago

/chatgpt what is async in javascript.

chatgptbot[bot] commented 1 year ago

@oceanlvr In JavaScript, async is a keyword that is used to create functions that are asynchronous. This means that they can run in the background and not block the main execution thread, allowing the application to continue running while the async function is being executed.

oceanlvr commented 1 year ago

/ping

chatgptbot[bot] commented 1 year ago

pong

oceanlvr commented 1 year ago

/chatgpt what is await in javascript.

chatgptbot[bot] commented 1 year ago

@oceanlvr In JavaScript, the await keyword is used to pause the execution of a function until a promise is resolved. When await is called on a promise, the function will pause until the promise is settled, and then the function will continue with the resolved value of the promise. Here is an example of how await might be used:

async function getData() {
  // `await` will pause the execution of the function until the
  // promise is resolved.
  const data = await somePromise();

  // The function will continue with the resolved value of the
  // promise, which will be stored in the `data` variable.
  console.log(data);
}

await only works within an async function, and it can only be used to wait for a promise to be resolved. It cannot be used with regular values or other non-promise objects.

chatgptbot[bot] commented 1 year ago

@oceanlvr Here is a refactored version of the code that uses async/await and Promises to avoid callback hell:

app.get("/details", async function (req, res) {
  try {
    const name = req.query.name;
    console.log(name);

    const result = await Scopus.find({ name: name }, { '_id': 0, 'authorId': 1 });
    const searchResult = result[0]["authorId"];
    console.log(searchResult);

    const options = {
      url: `https://api.elsevier.com/content/author/author_id/${searchResult}?apiKey`,
      headers: { 'Accept': 'application/json' }
    };

    const response = await request(options);

    const jsonObj = JSON.parse(response);
    if (jsonObj['author-retrieval-response'] == undefined) {
      res.send("No details");
    }
    else {
      const reqData = jsonObj['author-retrieval-response'][0];
      const authprofile = reqData["author-profile"];
      const names = authprofile["preferred-name"]["indexed-name"];
      console.log(names);
      const citation = reqData["coredata"]["citation-count"];
      const query = { authorId: searchResult };

      const doc = await Scopus.findOneAndUpdate(query, {
        name: names,
        citationCount: citation
      });

      if (doc) {
        console.log("success");
      }

      res.render("details", { data: reqData });
    }
  } catch (err) {
    // Print the error if one occurred
    console.error('error in Authors :', err);

    // Print the response status code if a response was received
    console.log('statusCode:', response && response.statusCode);
    res.send("error");
  }
});

Note that the request function is not included in the code snippet and it is assumed that it returns a Promise. Also, note that this refactored code assumes that the Scopus object has methods like find and findOneAndUpdate that also return Promises.