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| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer - Multiple Choice |
| Exam Number: | JS-Dev-101 |
| Exam Price: | USD 200 |
| Passing Score: | 65% |
| Exam Format: | Multiple select, Multiple choice |
| Available Languages: | English, Japanese |
| Exam Duration: | 105 minutes |
| Certificate Validity Period: | Does not expire; requires maintenance updates |
| Related Certifications: | Salesforce Certified Developer Salesforce Certified Platform Developer I |
| Real Exam Qty: | 60 scored + up to 5 unscored |
| Recommended Training: | Trailhead JavaScript Developer I Certification Prep |
| Exam Registration: | Salesforce Certification Registration |
| Sample Questions: | Salesforce JS-Dev-101 Sample Questions |
| Exam Way: | Online proctored or onsite at authorized testing centers |
| Pre Condition: | No formal prerequisites; recommended: strong JavaScript fundamentals, ES6+ experience, web development familiarity |
| Official Syllabus URL: | https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101 |
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NEW QUESTION # 40
A developer is trying to handle an error within a function.
Which code segment shows the correct approach to handle an error without propagating it elsewhere?
Answer: C
NEW QUESTION # 41
A developer implements and calls the following code when an application state change occurs:
Const onStateChange =innerPageState) => {
window.history.pushState(newPageState, ' ', null);
}
If the back button is clicked after this method is executed, what can a developer expect?
Answer: A
NEW QUESTION # 42
01 let obj = {
02 fool 1,
03 bari 2
04 )
05 let output = [7#
08 output .push (something);
09 )
10
11 conssie.tog (output):
What is the outpouf tlin e 117
Answer: B
NEW QUESTION # 43
A page loads 50+ <div class="ad-library-item"> elements, all ads.
Developer wants to quickly and temporarily remove them.
Options:
Answer: B
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge The goal:
"Temporarily and quickly remove them."
The fastest way is to run a script in the browser console that removes all such elements:
document.querySelectorAll('.ad-library-item').forEach(el => el.remove()); This immediately removes all 50+ elements and requires no page reload.
Option analysis:
A & B: Preventing load events is unreliable and does not remove already-created DOM nodes.
C: Correct-console code can remove all matching DOM elements instantly.
D: Possible but extremely slow; removing 50+ elements one by one in the inspector is not "quick." Therefore, C is the best answer.
________________________________________
JavaScript Knowledge Reference (text-only)
The browser console can run arbitrary JavaScript that manipulates the DOM.
document.querySelectorAll() returns all matching DOM nodes.
Nodes can be removed using .remove().
NEW QUESTION # 44
Corrected code:
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 result after line 10 executes?
Answer: B
Explanation:
The verified answer is A.
This constructor function runs when new Person() is called:
function Person() {
this.firstName = "John";
}
So this line:
const myFather = new Person();
creates an object like this:
{
firstName: "John"
}
Then the prototype is assigned a method named job:
Person.prototype = {
job: x => "Developer"
};
Because myFather is created from Person, it can access properties and methods from Person.prototype.
So:
myFather.firstName
returns:
"John"
And:
myFather.job()
returns:
"Developer"
Therefore:
const result = myFather.firstName + " " + myFather.job();
becomes:
const result = "John" + " " + "Developer";
Final value:
"John Developer"
Option B is incorrect because job() returns "Developer", not undefined.
Option C is incorrect because job exists on Person.prototype, so it is callable.
Option D is incorrect because firstName is assigned inside the constructor.
Therefore, the verified answer is A.
NEW QUESTION # 45
......
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