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Pass Salesforce Developer JavaScript-Developer-I Exam With 160 Questions
NEW QUESTION 47
A class was written to represent items for purchase in an online store, and a second class representing items that are on sale at a discounted price. The constructor sets the name to the first value passed in. The pseudocode is below:
There is a new requirement for a developer to implement a description method that will retrun a brief description for item and saleitem.
What is the out when executing the code above?
- A. This is a Scarf
This is a Shirt
This is a discounted Scard
This is a discounted Shirt - B. This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt - C. This is a Scarf
Unicaught TypeError: saleitem, description is not a function
This is a Scarf
This is a discounted Shirt - D. This is a Scaf
Uncaught TypeError: saleItem, description is not a function
This is a Shirt
This is a discounted Shirt
Answer: B
NEW QUESTION 48
Which two code snippets show working examples of a recursive function?
Choose 2 answers
A)
B)
C)
D)
- A. Option C
- B. Option B
- C. Option A
- D. Option D
Answer: A,D
NEW QUESTION 49
Refer to the code:
Given the code above, which three properties are set for pet1? Choose 3 answers
- A. name
- B. speak
- C. type
- D. canTalk
- E. owner
Answer: A,C,D
NEW QUESTION 50
Refer to the HTML below:
Which JavaScript statement results in changing ''Tony'' to ''Mr. T. ''?
- A. Document.querySelector (' '#main li:second-child') innerHTML, = Mr, T, ';
- B. Document.querySelector (''#main li:nth-child (2) ') , innerHTML = 'Mr . T ';
- C. Document.querySelectorAll ('#main # TONY ') , innerHTML = Mr, T , ' ;
- D. Document.querySelectorAll ( '#main li, Tony ' ) innerHTNL = Mr, T , ' ;
Answer: C
NEW QUESTION 51
Refer to the code below:
Let searchString = ' Look for this ';
Which two options remove the whitespace from the beginning of searchString? Choose 2 answers
- A. searchString. Replace (/^\a\a'/' ' ') ;
- B. searchString. trimEnd ( ) ;
- C. searchString. trimstart ( ) ;
- D. trimStart (searchString) ;
Answer: A,C
NEW QUESTION 52
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?
- A.
- B.
- C.
- D.
Answer: A
NEW QUESTION 53
Refer to the code below:
Which statement allows a developer to cancel the scheduled timed function?
- A. ClearTimeout (timeFunction);
- B. removeTimeout (timeFunction) ;
- C. ClearTimeout (timerId) ;
- D. removeTimeout (timerId) ;
Answer: B
NEW QUESTION 54
Which code statement below correctly persists an objects in local Storage ?
- A. const setLocalStorage = (storageKey, jsObject) => {
window.localStorage.persist(storageKey, jsObject);
} - B. const setLocalStorage = (storageKey, jsObject) => {
window.localStorage.setItem(storageKey, JSON.stringify(jsObject));
} - C. const setLocalStorage = ( jsObject) => {
window.localStorage.setItem(jsObject);
} - D. const setLocalStorage = ( jsObject) => {
window.localStorage.connectObject(jsObject));
}
Answer: B
NEW QUESTION 55
Which two console logs out NaN?
Choose 2 answers
- A. Console.log(10 / 'five' ') ;
- B. Console.log(10 / Number ('5) );
- C. Console.log (10 / 0);
- D. Console.log(parseint ('two') ) ;
Answer: A,D
NEW QUESTION 56
Refer to the code below:
What is the value result after line 10 executes?
- A. John Developer
- B. Undefined Developer
- C. John undefined
- D. Error: myfather.job is not a function
Answer: D
NEW QUESTION 57
Refer to the code below:
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options could a developer insert at the placeholder in line 02 to achieve this? Choose 2 answers
- A. {type ; update ', recordId : '123abc')
- B. 'update', {
Detail ; {
recordId, '123abc
)
) - C. 'update', ( recordId ; 123abc'
) - D. 'update' , '123abc'
Answer: B,C
NEW QUESTION 58
Refer to the code below:
Which code executes syhello once, two minutes from now?
- A. SetInterval (sayhello, 120000) ;
- B. SetTimeout (sayhello( ), 120000) ;
- C. delay (sayhello, 120000) ;
- D. SetTimeout (sayhello, 120000) ;
Answer: B
NEW QUESTION 59
Universal Containers (UC) just launched a new landing page, but users complain that the website is slow. A developer found some functions any that might cause this problem. To verify this, the developer decides to execute everything and log the time each of these three suspicious functions consumes.
Which function can the developer use to obtain the time spent by every one of the three functions?
- A. console.getTime ()
- B. console.timeStamp ()
- C. console.trace()
- D. console. timeLog ()
Answer: D
NEW QUESTION 60
Universal Containers recently its new landing page to host crowd-function campaign. The page uses an external library to display some third-party ads. Once the page is fully loaded, It creates more than 50 new HTML items placed randomly inside the DOM, like the one in the code below.
All the elements included the same ad-library-item class. They are hidden by default, and they are randomly displayed while the user navigation through the page.
Tired of all the ads, what can the developer do to temporarily and quickly remove them?
- A. Use the browser console to execute a script that removes all the elements containing the class ad-library-item.
- B. Use the DOM inspector to remove all the elements containing the call ad-library -item.
- C. Use the browser console to execute a script that prevents the load event to be fired.
- D. Use the DOM inspector to prevent the load event to be fired.
Answer: A
NEW QUESTION 61
A developer implements and calls the following code when an application state change occurs:
If the back button is clicked after this method is executed, what can a developer expect?
- A. The page is navigated away from and previous page in the browser's history is loaded.
- B. The page reloads and all JavaScript is reinitialized.
- C. A popstate event is fired with a state properly that details the application's last state.
- D. A navigate event is fired with a state properly that details previous application state.
Answer: A
NEW QUESTION 62
A developer at Universal Container creates a new landing page based on HTML, CSS, and JavaScript.
To ensure that visitors have a good experience, a script named personalizeewebsiteCotent needs to be executed when the webpage is fully loaded (HTML content and all related files), in order to do some custom initialization.
Which statement should be used to call personalizeWebsiteContent based on the above business requirement?
- A. Document,addEventListener ('DCMContentLoaded' , personalizeWebsiteContent);
- B. Window, addEventListener('load', personalizewebsiteContent);
- C. Document, addEventListener ('oDCMContentLoaded' , personalizewensiteContent);
- D. Window, addEventListener('onload', personalizewebsiteContent);
Answer: B
NEW QUESTION 63
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?
- A. B
- B. C
- C. A
- D. D
Answer: C
NEW QUESTION 64
A developer wrote the following code:
The developer has a getNextValue function to execute after handleObjectvalue ( ), but does not want to execute getNextValues ( ) If an error occurs.
How can the developer change the code to ensure this behavior?
A)
B)
C)
- A. Option B
- B. Option C
- C. Option A
- D. Option D
Answer: D
NEW QUESTION 65
A test has a dependency on database. query. During the test, the dependency is replaced with an object called database with the method, Calculator query, that returns an array. The developer does not need to verify how many times the method has been called.
Which two test approaches describe the requirement?
Choose 2 answers
- A. White box
- B. Stubbing
- C. Substitution
- D. Black box
Answer: A,C
NEW QUESTION 66
......
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