Salesforce Javascript-Developer-I Question Answers

Question # 1

Which codestatement below correctly persists an objects in local Storage ?

A. const setLocalStorage = (storageKey, jsObject) => { window.localStorage.setItem(storageKey, JSON.stringify(jsObject)); }
B. const setLocalStorage = ( jsObject) => { window.localStorage.connectObject(jsObject)); }
C. const setLocalStorage = ( jsObject) => { window.localStorage.setItem(jsObject); }
D. const setLocalStorage = (storageKey, jsObject) => { window.localStorage.persist(storageKey, jsObject); }

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Question # 2

A developer wants to define a function log to be used a few times on a single-file JavaScript script. 01 // Line 1 replacement 02 console.log('"LOG:', logInput); 03 } Which two options can correctly replace line 01 and declare the function for use? Choose 2 answers 
 

A. function leg(logInput) {
B. const log(loginInput) {
C. const log = (logInput) => {
D. function log = (logInput) {

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Question # 3

 A developer wants to create an object from a function in the browser using the code below: Function Monster() { this.name =‘hello’ }; Const z = Monster(); What happens due to lack of the new keyword on line 02? 
 

A. The z variable is assigned the correct object.
B. The z variable is assigned the correct object but this.name remains undefined.
C. Window.name is assigned to ‘hello’ and the variable z remains undefined.
D. Window.m is assigned the correct object.

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Question # 4

A developer uses a parsed JSON string to work with userinformation as in the block below: 01 const userInformation ={ 02 “ id ” : “user-01”, 03 “email” : “[email protected]”, 04 “age” : 25 Which two options access the email attribute in the object? Choose 2 answers 
 

A. userInformation(“email”)
B. userInformation.get(“email”)
C. userInformation.email
D. userInformation(email)

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Question # 5

Considering type coercion, what does the following expression evaluate to? True + ‘13’ + NaN 
 

A. ‘ 113Nan ’
B. 14
C. ‘ true13 ’
D. ‘ true13NaN ’

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Question # 6

A developer creates a class that represents a blog post based on the requirement that a Post should have a body author and view count. The Code shown Below: ClassPost { // Insert code here This.body =body This.author = author; this.viewCount = viewCount; } } Which statement should be inserted in the placeholder on line 02 to allow for a variable to be set to a new instanceof a Post with the three attributes correctly populated? 
 

A. super (body, author, viewCount) {
B. Function Post (body, author, viewCount) {
C. constructor (body, author, viewCount) {
D. constructor() {

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Question # 7

Refer to the code below: Let foodMenu1 =[‘pizza’, ‘burger’, ‘French fries’]; Let finalMenu = foodMenu1; finalMenu.push(‘Garlic bread’); What is the value of foodMenu1 after the code executes? 
 

A. [ ‘pizza’,’Burger’, ‘French fires’, ‘Garlic bread’]
B. [ ‘pizza’,’Burger’, ‘French fires’]
C. [ ‘Garlic bread’ , ‘pizza’,’Burger’, ‘French fires’ ]
D. [ ‘Garlic bread’]

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Question # 8

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. timeLog ()
B. console.timeStamp ()
C. console.trace()
D. console.getTime ()

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Question # 9

Which three statements are true about promises ? Choose 3 answers 
 

A. The executor of a new Promise runs automatically.
B. A Promise has a .then() method.
C. A fulfilled or rejected promise will not change states .
D. A settled promise can become resolved.
E. A pending promise canbecome fulfilled, settled, or rejected.

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Question # 10

A developer creates an object where its properties should be immutable and prevent properties from being added or modified. Which method shouldbe used to execute this business requirement ? 
 

A. Object.const()
B. Object.eval()
C. Object.lock()
D. Object.freeze()

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