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;
        }
    });
}

Use asynchronous programming

Evaluated skills

Question 1

Question 2

Question 3