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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q105-Q110):

NEW QUESTION # 105
A class was written to represent regular items and sale items. Code:
01 let regItem = new Item('Scarf', 55);
02 let saleItem = new SaleItem('Shirt', 80, .1);
03 Item.prototype.description = function() { return 'This is a ' + this.name; }
04 console.log(regItem.description());
05 console.log(saleItem.description());
06
07 SaleItem.prototype.description = function() { return 'This is a discounted ' + this.name; }
08 console.log(regItem.description());
09 console.log(saleItem.description());
What is the output?

A. This is a Scarf
Uncaught TypeError: saleItem.description is not a function
This is a Scarf
This is a discounted Shirt
B. This is a Scarf
This is a Shirt
This is a discounted Scarf
This is a discounted Shirt
C. This is a Scarf
Uncaught TypeError: saleItem.description is not a function
This is a Shirt
This is a discounted Shirt
D. This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt

Answer: D

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge At line 03, the developer assigns:
Item.prototype.description = function() { return 'This is a ' + this.name; } This affects all objects whose prototype chain includes Item.prototype.
regItem inherits from Item → gets this method.
saleItem, as an instance of SaleItem, also inherits Item.prototype (since SaleItem uses prototype inheritance from Item), so it also has this method at this moment.
Outputs at lines 04 and 05:
regItem.description() → "This is a Scarf"
saleItem.description() → "This is a Shirt"
At line 07, the developer overrides the method on SaleItem.prototype:
SaleItem.prototype.description = function() {
return 'This is a discounted ' + this.name;
}
From this point:
regItem still uses the Item.prototype version
saleItem uses the overridden SaleItem.prototype version
Outputs at lines 08 and 09:
regItem.description() → "This is a Scarf"
saleItem.description() → "This is a discounted Shirt"
Combining all results:
This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt
This matches option B.
________________________________________
JavaScript Knowledge Reference (text-only)
Objects created from constructor functions use prototype chaining.
Overriding a subclass prototype method does not affect the parent class prototype.
Instances inherit the most specific version of the method on their prototype chain.

NEW QUESTION # 106
A Node.js server library uses events and callbacks. The developer wants to log any issues the server has at boot time.
Which code logs an error with an event?

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

Answer: A

Explanation:
console.log('ERROR', error);
}
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge Node.js event-based modules use the EventEmitter pattern.
The correct syntax for listening to events is:
emitter.on('eventName', callback)
The server library emits an 'error' event, which must be listened to using .on.
Option analysis:
A: .catch is for Promises, not EventEmitters.
B: .error is not an EventEmitter method.
C: Correct. Listens to the 'error' event.
D: try...catch only captures synchronous errors, not event-based asynchronous errors.
Therefore, the correct answer is option C.
________________________________________
JavaScript Knowledge Reference (text-only)
The EventEmitter API uses on(event, handler) to listen for events.
Errors emitted asynchronously cannot be caught with try...catch.
The 'error' event is standard for Node.js modules to signal operational errors.

NEW QUESTION # 107
static delay = async delay => {
return new Promise(resolve => {
setTimeout(resolve, delay);
});
};
static asyncCall = async () => {
await delay(1000);
console.log(1);
};
console.log(2);
asyncCall();
console.log(3);
(Assume delay and asyncCall are in scope as functions.)
What is logged to the console?

A. 1 3 2
B. 2 3 1
C. 2 1 3
D. 1 2 3

Answer: B

Explanation:
console.log(2); → logs 2.
asyncCall(); starts, but await delay(1000) pauses it until the promise resolves. No log yet from inside.
console.log(3); runs immediately → logs 3.
After ~1000ms, delay resolves, asyncCall resumes → logs 1.
Order: 2, 3, 1 → D.

NEW QUESTION # 108
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. 'Update' , {Details : {recordId : '123abc'}}
C. 'Update' , (recordId : '123abc'(
D. { type : 'update', recordId : '123abc' }

Answer: B,C

NEW QUESTION # 109
A developer has a fizzbuzz function that, when passed in a number, returns the following:
- 'fizz' if the number is divisible by 3.
- 'buzz' if the number is divisible by 5.
- 'fizzbuzz' if the number is divisible by both 3 and 5.
- empty string if the number is divisible by neither 3 or 5.
Which two test cases properly test scenarios for the fizzbuzz function?
Choose 2 answers

A. let res = fizzbuzz(NaN);
console.assert(isNaN(res));
B. let res = fizzbuzz(3);
console.assert(res === 'buzz');
C. let res = fizzbuzz(Infinity);
console.assert(res === '');
D. let res = fizzbuzz(15);
console.assert(res === 'fizzbuzz');

Answer: C,D

NEW QUESTION # 110
......

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JS-Dev-101 Authorized Test Dumps & New JS-Dev-101 Exam Objectives

New JS-Dev-101 Exam Objectives - Reliable JS-Dev-101 Test Sims

Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q105-Q110):

Pass Guaranteed Quiz 2026 Professional JS-Dev-101: Salesforce Certified JavaScript Developer - Multiple Choice Authorized Test Dumps

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