100% Pass 2026 Salesforce Fantastic JavaScript-Developer-I: Salesforce Certified JavaScript Developer (JS-Dev-101) Valid Exam Topics

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Objectives
Topic 1: Salesforce Platform Integration	- Calling Apex methods from JavaScript - Lightning Web Components (LWC) JavaScript usage - Security considerations in Salesforce JavaScript
Topic 2: Browser and DOM Interaction	- Browser APIs (fetch, storage, timers) - DOM manipulation and traversal - Event handling and propagation
Topic 3: JavaScript Language Fundamentals	- ES6+ syntax and features - Functions, scope, and closures - Data types, variables, and operators
Topic 4: Testing and Debugging	- Debugging techniques and tools - Unit testing principles
Topic 5: Asynchronous JavaScript	- Error handling in async workflows - Event loop and concurrency model - Promises and async/await

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q105-Q110):

NEW QUESTION # 105
Refer to the code below:

What is the value of result when Promise. race executes?

A. Car 2 completed the race
B. Car 1 crashed the race
C. Car 3 completed the race
D. Race is cancelled.

Answer: B

NEW QUESTION # 106
developer wants to use a module named universalContainersLib and them call functions from it.
How should a developer import every function from the module and then call the fuctions foo and bar ?

A. import * from '/path/universalContaineraLib.js';
universalContainersLib.foo();
universalContainersLib.bar();
B. import * ad lib from '/path/universalContainersLib.js';
lib.foo();
lib.bar();
C. import all from '/path/universalContaineraLib.js';
universalContainersLib.foo();
universalContainersLib.bar();
D. import (foo, bar) from '/path/universalContainersLib.js';
foo();
bar();

Answer: B

NEW QUESTION # 107
Cloud Kicks has a class to represent item for sale in an online store, as shown below:

A new business requirement comes in that request a clothingitem class, that should have all of the properties and methods of the item class, but will also have properties that are specific top clothes.
Which line of code properly declares the clothingitem class such that it inherits from item?

A. Class clothing item super item (
B. Class Clothingitem (
C. Class clothingitem implements item (
D. Class clothingitem extends item (

Answer: D

NEW QUESTION # 108
Universal Containers (UC) just launched a new landing page, but users complain that the website is slow. A developer found some functions 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.
01 console.time( ' Performance ' );
02
03 maybeAHeavyFunction();
04
05 thisCouldTakeTooLong();
06
07 orMaybeThisOne();
08
09 console.endTime( ' Performance ' );
Which function can the developer use to obtain the time spent by every one of the three functions?

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

Answer: D

Explanation:
JavaScript consoles (browsers and Node) provide timing utilities:
* console.time(label) - starts a timer with the given label.
* console.timeEnd(label) - stops the timer and logs the total elapsed time.
* console.timeLog(label) - logs the current elapsed time without stopping the timer.
To measure the time taken by each function separately while still using a single overall timer, you can log intermediate times:
console.time( ' Performance ' );
maybeAHeavyFunction();
console.timeLog( ' Performance ' , ' after maybeAHeavyFunction ' );
thisCouldTakeTooLong();
console.timeLog( ' Performance ' , ' after thisCouldTakeTooLong ' );
orMaybeThisOne();
console.timeLog( ' Performance ' , ' after orMaybeThisOne ' );
console.timeEnd( ' Performance ' );
* Each console.timeLog( ' Performance ' ) call prints the elapsed time since console.time( ' Performance ' ) was started, so you can infer how long each function took.
* Note: console.endTime in the original snippet is incorrect; the real method is console.timeEnd.
Why other options are incorrect:
* B. console.trace()
* Prints a stack trace, not timing information.
* C. console.timeStamp()
* Used with browser performance tools; it does not directly show elapsed times like timeLog or timeEnd.
* D. console.getTime()
* Not a standard console method.
Thus, the function that can be used to obtain timing between calls is:
The answer: A
Study Guide Concepts:
* console.time, console.timeLog, console.timeEnd
* Measuring performance and intermediate timings
* Standard console debugging API methods

NEW QUESTION # 109
Refer to the code below:
Const searchTest = 'Yay! Salesforce is amazing!" ;
Let result1 = searchText.search(/sales/i);
Let result 21 = searchText.search(/sales/i);
console.log(result1);
console.log(result2);
After running this code, which result is displayed on the console?

A. > 5>undefined
B. > 5 > -1
C. > 5 > 0
D. > true > false

Answer: B

NEW QUESTION # 110
......

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