Online Access Free JS-Dev-101 Exam Questions

Refer to the following object:
const dog = {
firstName: 'Beau',
lastName: 'Boo',
get fullName() {
return this.firstName + ' ' + this.lastName;
}
};
How can a developer access the fullName property for dog?

• A.dog.function.fullName()
• B.dog.fullName()
• C.dog.fullName
• D.dog.get.fullName

Refer to the code below:
01 new Promise((resolve, reject) => {
02 const fraction = Math.random();
03 if (fraction > 0.5) reject('fraction > 0.5, ' + fraction);
04 resolve(fraction);
05 })
06 .then(() => console.log('resolved'))
07 .catch((error) => console.error(error))
08 .finally(() => console.log('when am I called?'));
When does Promise.finally on line 08 get called?

• A.When resolved
• B.When resolved or rejected
• C.When rejected
• D.When resolved and settled

A developer at Universal Containers creates a new landing page based on HTML, CSS, and JavaScript.
To ensure that visitors have a good experience, a script named personalizeWebsiteContent needs to be executed to do some custom initialization when the webpage is fully loaded with HTML content and all related files.
Which statement should be used to call personalizeWebsiteContent based on the above business requirement?

• A.window.addEventListener('onload', personalizeWebsiteContent);
• B.window.addEventListener('load', personalizeWebsiteContent);
• C.document.addEventListener('DOMContentLoaded', personalizeWebsiteContent);
• D.document.addEventListener('onDOMContentLoaded', personalizeWebsiteContent);

Original code:
01 let requestPromise = client.getRequest;
03 requestPromise().then((response) => {
04 handleResponse(response);
05 });
The developer wants to gracefully handle errors from a Promise-based GET request.
Which code modification is correct?

• A.(duplicate of A)
• B.try/catch around requestPromise().then(...)
• C.Use finally handler for errors
• D.Add .catch to the Promise chain

Refer to the following code:
01 let obj = {
02 foo: 1,
03 bar: 2
04 }
05 let output = []
06
07 for (let something of obj) {
08 output.push(something);
09 }
10
11 console.log(output);
What is the value of output on line 11?

• A.["foo", "bar"]
• B.["foo:1", "bar:2"]
• C.[1, 2]
• D.An error will occur due to the incorrect usage of the for_of statement on line 07.