JavaScript-Developer-I Dumps PDF - JavaScript-Developer-I Real Exam Questions Answers
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Salesforce JavaScript Developer I Certification Path
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NEW QUESTION 68
Refer to code below:
function Person() {
this.firstName = 'John';
}
Person.prototype ={
Job: x => 'Developer'
};
const myFather = new Person();
const result =myFather.firstName + ' ' + myFather.job();
What is the value of the 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 69
Which function should a developer use to repeatedly execute code at a fixed time interval?
- A. setTimeout
- B. setInterim
- C. setPeriod
- D. setInterval
Answer: D
NEW QUESTION 70
A developer creates a generic function to log custom messages in the console. To do this, the function below is implemented.
01 function logStatus(status){
02 console./*Answer goes here*/{'Item status is: %s', status};
03 }
Which three console logging methods allow the use of string substitution in line 02?
- A. Info
- B. Message
- C. Log
- D. Error
- E. Assert
Answer: A,C,E
NEW QUESTION 71
Refer to the code below:
Let textvalue = '1984';
Which code segment shows a correct way to convert this string to an integer?
- A. Let numberValue = Integer ( textValue );
- B. Let numberValue = textValue. Tointeger ( ) ;
- C. Let numberValue = (Number) textvalue;
- D. Let numberValue = Number(textvalue);
Answer: D
NEW QUESTION 72
Refer to the code below:
01 const exec = (item, delay) =>{
02 new Promise(resolve => setTimeout( () => resolve(item), delay)),
03 async function runParallel() {
04 Const (result1, result2, result3) = await Promise.all{
05 [exec ('x', '100') , exec('y', 500), exec('z', '100')]
06 );
07 return `parallel is done: $(result1) $(result2)$(result3)`;
08 }
}
}
Which two statements correctly execute the runParallel () function?
Choose 2 answers
- A. runParallel ( ). done(function(data){
return data;
}); - B. runParallel () .then(data);
- C. runParallel () .then(function(data)
return data - D. Async runParallel () .then(data);
Answer: A,C
NEW QUESTION 73
Refer the following code
what is the value of array after code executes?
Answer:
Explanation:
[ 1, 2, 3, 5 ]
NEW QUESTION 74
Given the following code:
document.body.addEventListener(' click ', (event) => {
if (/* CODE REPLACEMENT HERE */) {
console.log('button clicked!');
)
});
Which replacement for the conditional statement on line 02 allows a developer to
correctly determine that a button on page is clicked?
- A. Event.clicked
- B. event.target.nodeName == 'BUTTON'
- C. button.addEventListener('click')
- D. e.nodeTarget ==this
Answer: B
NEW QUESTION 75
A developer is working on an ecommerce website where the delivery date is dynamically calculated based on the current dat. The code line below is responsible for this calculation.
Const deliveryDate = new Date ( );
Due to changes in the business requirements, the delivery date must now be today's date + 9 days.
Which code meets this new requirements?
- A. deliveryDate. Date = new Date (+9) ;
- B. deliveryDate . date = date . current () + 9
- C. deliveryDate. setDate ( Date . current () + 9 0;
- D. deliveryDate. setDate (( new Date ()) .getDate () + 9);
Answer: D
NEW QUESTION 76
Refer to the following code:
function test (val) {
If (val === undefined) {
return 'Undefined values!' ;
}
if (val === null) {
return 'Null value! ';
}
return val;
}
Let x;
test(x);
What is returned by the function call on line 13?
- A. Line 13 throws an error.
- B. 'Undefined values!'
- C. 'Null value!'
- D. Undefined
Answer: B
NEW QUESTION 77
Refer to the HTML below:
Which JavaScript statement results in changing ''Tony'' to ''Mr. T. ''?
- A. Document.querySelectorAll ('#main # TONY ') , innerHTML = Mr, T , ' ;
- B. Document.querySelector (' '#main li:second-child') innerHTML, = Mr, T, ';
- C. Document.querySelectorAll ( '#main li, Tony ' ) innerHTNL = Mr, T , ' ;
- D. Document.querySelector (''#main li:nth-child (2) ') , innerHTML = 'Mr . T ';
Answer: A
NEW QUESTION 78
Given the code below:
Which method can be used to provide a visual representation of the list of users and to allow sorting by the name or email attribute?
- A. console.info(usersList) ;
- B. console.group(usersList) ;
- C. console.table(usersList) ;
- D. console.groupCol lapsed (usersList) ;
Answer: B
NEW QUESTION 79
A developer is leading the creation of a new web server for their team that will fulfill API requests from an existing client.
The team wants a web server that runs on Node.Js, and they want to use the new web framework Minimalist.Js. The lead developer wants to advocate for a more seasoned back-end framework that already has a community around it.
Which two frameworks could the lead developer advocate for?
Choose 2 answers
- A. Koa
- B. Gatsby
- C. Express
- D. Angular
Answer: C,D
NEW QUESTION 80
Refer to the code below:
let car1 = new Promise((_ ,reject)=> setTimeout(reject,2000,"Car1 crashed in")); let car2 = new Promise(resolve => setTimeout(resolve,1500,"Car2 completed")); let car3 = new Promise(resolve => setTimeout(resolve,3000,"Car3 completed")); Promise.race([car1,car2,car3])
.then(value=>{
let result = `${value} the race.`;
}).catch(err=>{
console.log('Race is cancelled.',err);
});
What is the value of result when promise.race execues?
- A. Car2 completed the race.
Answer: A
NEW QUESTION 81
Which statement can a developer apply to increment the browser's navigation history without a page refesh?
- A. Window.history,state,push.(newStateObject, ' ' null;
- B. Window.history,state,push.(newStateObject);
- C. Window.history,pushState.(newStateObject);
- D. Window.history,pushState.(newStateObject, ' ', null)) ;
Answer: A
NEW QUESTION 82
Refer to the code below:
console.log(''start);
Promise.resolve('Success') .then(function(value){
console.log('Success');
});
console.log('End');
What is the output after the code executes successfully?
- A. Start
End
Success - B. Success
Start
End - C. End
Start
Success - D. Start
Success
End
Answer: A
NEW QUESTION 83
There is a new requirement for a developer to implement a currPrice method that will return the current price of the item or sales..
What is the output when executing the code above
- A. 50
80
50
72 - B. 50
80
Uncaught Reference Error:this,discount is undefined
72 - C. 50
Uncaught TypeError: saleItem,desrcription is not a function
50
80 - D. 50
80
72
Answer: A
NEW QUESTION 84
Given the following code, what is the value of x?
let x = '15' + (10 * 2);
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
NEW QUESTION 85
A developer wants to create an object from a function in the browser using the code below.
What happens due to the lack of the mm keyword on line 02?
- A. window.name is assigned to 'hello' and the variable = remains undefined.
- B. The m variable is assigned the correct object but this.name remains undefined.
- C. The m variable is assigned the correct object.
- D. window.m Is assigned the correct object.
Answer: A
NEW QUESTION 86
A developer has the following array of student test grades:
Let arr - [7, 8, 5, 9]
How should want to double each score and then see an array of the students who scored more than 15 points.
How should the developer implement the request?
- A. Let arr1 = arr.mapBy ((num) => return num + 2 )) .filterBy ((val) => ( return val > 15 )) ;
- B. Let arr1 = arr .filter ((filter ((val) => ( return val > 15 )) .map (( num => ( return num +2 ));
- C. Let arr1 = arr.map ((num) => num + 2 .filter ((val) => val 15 );
- D. Let arr1 = arr .map ((num => ( num + 2 )) .filterBy ((val => ( val 15 )) ;
Answer: C
NEW QUESTION 87
Refer to the code below:
When does promise. Finally on line 08 get called?
- A. When resolved or rejected
- B. When rejected
- C. When resolved and settled
- D. When resolved
Answer: A
NEW QUESTION 88
......
How to Prepare for Salesforce JavaScript Developer I Exam
Preparation Guide for Salesforce JavaScript Developer I Exam
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