• 10 hours
  • Medium
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Last updated on 4/2/20

Use asynchronous programming

Evaluated skills

  • build and send AJAX requests
  • handle AJAX response data
  • use async/await
  • handle errors

  • Question 1

    Which of the following correctly handles a promise?

    • myPromise.try(
    (data) => {
        console.log(data);
    }
).catch(
    (error) => {
        console.log(error);
    }
);

    • myPromise.then(
    (data) => {
        console.log(data);
    }
).catch(
    (error) => {
        console.log(error);
    }
);

    • myPromise.then(
    (data) => {
        console.log(data);
    }
).error(
    (error) => {
        console.log(error);
    }
);

    • myPromise.resolve(
    (data) => {
        console.log(data);
    }
).reject(
    (error) => {
        console.log(error);
    }
);

  • Question 2

    Which of the following describes the three states of a promise?

      • Promise is started
      • Promise is pending
      • Promise is resolved
      • Promise is implemented
      • Promise is resolved
      • Promise is complete
      • Promise is pending
      • Promise is resolved
      • Promise is rejected
      • Promise is resolved
      • Promise is rejected
      • Promise is complete

  • Question 3

    Which of the following correctly creates a function which returns a promise?

    • function makeMeAPromise() {
    return new Promise((resolve, reject) => {
        // Do some stuff here
        if (success) {
            resolve(successData);
        }
        else {
            reject(errorData);
        }
    });
}

       

    • function makeMeAPromise() {
    return new Promise(resolve, reject) => {
        // Do some stuff here
        if (success) {
            resolve(successData);
        }
        else {
            reject(errorData);
        }
    };
}

    • function makeMeAPromise() {
    return new Promise((resolve, reject) => {
        // Do some stuff here
        success.then(data).catch(error);
    });
}

    • function makeMeAPromise() {
    return new Promise((resolve, reject) => {
        // Do some stuff here
        if (success) {
            return successData
        }
        else {
            return error;
        }
    });
}
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