Pass Salesforce JavaScript-Developer-I Exam Info and Free Practice Test
New 2025 Latest Questions JavaScript-Developer-I Dumps - Use Updated Salesforce Exam
NEW QUESTION # 67
Refer to the code below:
Which value can a developer expect when referencing country,capital,cityString?
- A. 'London'
- B. undefined
- C. An error
- D. 'NaN'
Answer: D
NEW QUESTION # 68
Refer to the code:
Given the code above, which three properties are set pet1?
Choose 3 answers:
- A. canTalk
- B. Owner
- C. Name
- D. Type
- E. Size
Answer: A,D,E
NEW QUESTION # 69
Which statement accurately describes an aspect of promises?
- A. Agruments for the callback function passed to .then ( ) are optional.
- B. .then ( ) manipulates and returns the original promise.
- C. In a , them ( ) function, returning results is not necessary since callback will catch the result of a previous promise.
- D. .Them ( ) cannot be added after a catch.
Answer: A
NEW QUESTION # 70
A developer wants to use a module called DataPrettyPrint. This module exports one default function called printDate ().
How can a developer import and use the printDate() function?
A)
B)
C)
D)
- A. Option D
- B. Option A
- C. Option B
- D. Option C
Answer: C
NEW QUESTION # 71
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. e.nodeTarget ==this
- C. event.target.nodeName == 'BUTTON'
- D. button.addEventListener('click')
Answer: C
NEW QUESTION # 72
A developer wrote the following code:
01 let X = object.value;
02
03 try {
04handleObjectValue(X);
05 } catch (error) {
06 handleError(error);
07 }
Thedeveloper has a getNextValue function to execute after handleObjectValue(), but does not want to execute getNextValue() if an error occurs.
How can the developer change the code to ensure this behavior?
- A. 03 try{04 handleObjectValue(x);05 } catch(error){06 handleError(error);07 } finally {08 getNextValue();10 }
- B. 03 try {04 handleObjectValue(x)05 ........................
- C. 03 try{04 handleObjectValue(x);05 } catch(error){06 handleError(error);07 }08 getNextValue();
- D. 03 try{04 handleObjectValue(x);05 }catch(error){06 handleError(error);07 } then {08 getNextValue();09 }
Answer: B
NEW QUESTION # 73
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:
Class Post {
// 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. constructor() {
- B. super (body, author, viewCount) {
- C. Function Post (body, author, viewCount) {
- D. constructor (body, author, viewCount) {
Answer: D
NEW QUESTION # 74
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. Stubbing
- B. Black box
- C. Substitution
- D. White box
Answer: C,D
NEW QUESTION # 75
A developer wants to use a try...catch statement to catch any error that countSheep () may throw and pass it to a handleError () function.
What is the correct implementation of the try...catch?
- A.
- B.
- C.
- D.
Answer: C
NEW QUESTION # 76
Refer to the code below:
What is the value of result after line 10 executes?
- A. Error: myFather.job is not a function
- B. John Developer
- C. undefined Developer
- D. John undefined
Answer: B
NEW QUESTION # 77
Refer to the code below:
const event = new CustomEvent(
//Missing Code
);
obj.dispatchEvent(event);
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. 'Update' , '123abc'
- B. { type : 'update', recordId : '123abc' }
- C. 'Update' , (
recordId : '123abc'
( - D. 'Update' , {
Details : {
recordId : '123abc'
Answer: C,D
Explanation:
}
}
NEW QUESTION # 78
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.map ((num) => num + 2 .filter ((val) => val 15 );
- C. Let arr1 = arr .filter ((filter ((val) => ( return val > 15 )) .map (( num => ( return num +2 ));
- D. Let arr1 = arr .map ((num => ( num + 2 )) .filterBy ((val => ( val 15 )) ;
Answer: B
NEW QUESTION # 79
A developer wants to create an object from a function in the browser using the code below.
What happens due to lack of the new keyword on line 02?
- A. The n variable is assigned the correct object but this- remains undefined.
- B. The a variable is assigned the correct object.
- C. Window. === name is assigned to ''hello'' and the variable a n remain undefined.
- D. Window. n is assigned the correct object.
Answer: C
NEW QUESTION # 80
A developer writers the code below to calculate the factorial of a given number.
Function factorial(number) {
Return number + factorial(number -1);
}
factorial(3);
What is the result of executing line 04?
- A. RuntimeError
- B. 0
- C. -Infinity
- D. 1
Answer: A
NEW QUESTION # 81
What is the result of the code block?
- A. The console logs only 'flag'.
- B. The console logs 'flag' and then an error is thrown.
- C. The console logs 'flag' and another flag.
- D. An error is thrown.
Answer: B
NEW QUESTION # 82
Refer to the following array:
Let arr = [ 1,2, 3, 4, 5];
Which three options result in x evaluating as [3, 4, 5] ?
Choose 3 answers.
- A. Let x= arr.filter((a) => ( return a>2 ));
- B. Let x= arr.slice(2);
- C. Let x= arr.splice(2,3);
- D. Let x = arr.slice(2,3);
- E. Let x= arr.filter (( a) => (a<2));
Answer: A,B,C
NEW QUESTION # 83 
Which code change should be done for the console to log the following when 'Click me!' is clicked'
> Row log
> Table log
- A. Remove lines 13 and 14
- B. Remove line 10
- C. Change line 10 to event.stopPropagation (false) ;
- D. Change line 14 to elem.addEventListener ('click', printMessage, true);
Answer: B
NEW QUESTION # 84
......
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