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Salesforce JS-Dev-101 Exam Overview:

Certification Vendor:Salesforce
Exam Name:Salesforce Certified JavaScript Developer - Multiple Choice
Exam Number:JS-Dev-101
Real Exam Qty:60 scored + up to 5 unscored
Exam Duration:105 minutes
Exam Format:Multiple choice, Multiple select
Related Certifications:Salesforce Certified Platform Developer I
Salesforce Certified Developer
Certificate Validity Period:Does not expire; requires maintenance updates
Passing Score:65%
Available Languages:Japanese, English
Exam Price:USD 200
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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Salesforce JS-Dev-101 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Topic 2
  • Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 3
  • Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 4
  • Objects, Functions, and Classes: Covers function, object, and class implementations to meet business requirements, along with the use of modules, decorators, variable scope, and execution flow.

Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q25-Q30):

NEW QUESTION # 25
Given the code below:
01 setCurrentUrl();
02 console.log("The current URL is: " + url);
03
04 function setCurrentUrl() {
05 url = window.location.href;
06 }
What happens when the code executes?

Answer: A

Explanation:
Inside setCurrentUrl, url is assigned without var, let, or const:
url = window.location.href;
In non-strict mode, this implicitly creates a global variable url on window.
Execution order:
setCurrentUrl(); creates/sets global url to window.location.href.
console.log("The current URL is: " + url); has access to url in global scope and prints correctly.
Thus:
url has global scope.
Line 02 runs without error and logs a valid string.
So B is correct.
________________________________________


NEW QUESTION # 26
Refer to code below:
Let first = 'who';
Let second = 'what';
Try{
Try{
Throw new error('Sad trombone');
}catch (err){
First ='Why';
}finally {
Second ='when';
} catch (err) {
Second ='Where';
}
What are the values for first and second once the code executes ?

Answer: B


NEW QUESTION # 27
A developer wants to use a module named universalContainerslib and then call functions from it. How should a developer import every function from the module and then call the functions foo and bar?

Answer: B

Explanation:
import * as lib from '...' imports all named exports from the module into the namespace object lib.
You then call:
lib.foo();
lib.bar();
Option D correctly imports only foo and bar, not every function. The question explicitly says "import every function... and then call foo and bar", so A best matches.
Options B and C are invalid syntax or reference the wrong identifier.
________________________________________


NEW QUESTION # 28
Refer the code below.
x=3.14;
function myfunction() {
"use strict";
y=x;
}
z=x;
myFunction();

Answer:

Explanation:
See the Answer below in explanation


NEW QUESTION # 29
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?

Answer: A

Explanation:
Comprehensive and Detailed
Errors thrown inside setTimeout callbacks occur asynchronously, in a different tick of the event loop. A try...catch around setTimeout itself (as in D) cannot catch errors thrown later in the scheduled callback.
To catch errors from countSheep() when it's called asynchronously, the try...catch must wrap the call inside the timeout callback:
setTimeout(function() {
try {
countSheep();
} catch (e) {
handleError(e);
}
}, 1000);
B uses finally incorrectly and references e out of scope.
C is not valid JavaScript syntax.
D's catch can only handle synchronous errors thrown before setTimeout returns, not those thrown inside the callback.


NEW QUESTION # 30
......

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