Salesforce JavaScript-Developer-I Questions: An Incredible Exam Preparation Way [2026]

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q45-Q50):

NEW QUESTION # 45
Given the code below:
01 function GameConsole (name) {
02 this.name = name;
03 }
04
05 GameConsole.prototype.load = function(gamename) {
06 console.log( ` $(this.name) is loading a game : $(gamename) ...`);
07 )
08 function Console 16 Bit (name) {
09 GameConsole.call(this, name) ;
10 }
11 Console16bit.prototype = Object.create ( GameConsole.prototype) ;
12 //insert code here
13 console.log( ` $(this.name) is loading a cartridge game : $(gamename) ...`);
14 }
15 const console16bit = new Console16bit(' SNEGeneziz ');
16 console16bit.load(' Super Nonic 3x Force ');
What should a developer insert at line 15 to output the following message using the method ?
> SNEGeneziz is loading a cartridge game: Super Monic 3x Force . . .

A. Console16bit.prototype.load(gamename) = function() {
B. Console16bit.prototype.load(gamename) {
C. Console16bit = Object.create(GameConsole.prototype).load = function
(gamename) {
D. Console16bit.prototype.load = function(gamename) {

Answer: D

NEW QUESTION # 46
Which code statement below correctly persists an objects in local Storage ?

A. const setLocalStorage = ( jsObject) => {
window.localStorage.setItem(jsObject);
}
B. const setLocalStorage = (storageKey, jsObject) => {
window.localStorage.setItem(storageKey, JSON.stringify(jsObject));
}
C. const setLocalStorage = (storageKey, jsObject) => {
window.localStorage.persist(storageKey, jsObject);
}
D. const setLocalStorage = ( jsObject) => {
window.localStorage.connectObject(jsObject));
}

Answer: B

Explanation:

NEW QUESTION # 47
Refer to the code below:

What is displayed when myfunction(true) is called?

A. 2 2 1 1
B. 2 2 1 2
C. 2 2 undefined undefined
D. 2 2 2 2

Answer: A

NEW QUESTION # 48
A developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality. The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.
Which code logs an error at boot time with an event?

A. server.on( ' error ' , (error) = > {
console.log( ' ERROR ' , error);
});
B. try {
server.start();
} catch(error) {
console.log( ' ERROR ' , error);
}
C. server.catch((error) = > {
console.log( ' ERROR ' , error);
});
D. server.error((error) = > {
console.log( ' ERROR ' , error);
});

Answer: A

Explanation:
* Event-driven Node-style APIs expose events via .on(eventName, handler).
* To listen for error events:
server.on( ' error ' , (error) = > {
console.log( ' ERROR ' , error);
});
* A and B assume methods .error or .catch that don't exist on typical event emitters.
* C only catches synchronous errors from server.start(), not async event-based errors.

NEW QUESTION # 49
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: B

NEW QUESTION # 50
......

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