Free PDF 2026 JS-Dev-101: Salesforce Certified JavaScript Developer - Multiple Choice Accurate PDF Cram Exam

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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Topic 2	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 3	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Topic 4	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q89-Q94):

NEW QUESTION # 89
Refer to the following code block:
class Animal{
constructor(name){
this.name = name;
}
makeSound(){
console.log(`${this.name} ismaking a sound.`)
}
}
class Dog extends Animal{
constructor(name){
super(name)
this.name = name;
}
makeSound(){
console.log(`${this.name} is barking.`)
}
}
let myDog = new Dog('Puppy');
myDog.makeSound();
What is the console output?

Answer:

Explanation:
Puppy is barking

NEW QUESTION # 90
A developer creates a simple webpage with an input field. When a user enters text and clicks the button, the actual value must be displayed in the console:
HTML:
<input type="text" value="Hello" name="input">
<button type="button">Display</button>
JavaScript:
01 const button = document.querySelector('button');
02 button.addEventListener('click', () => {
03 const input = document.querySelector('input');
04 console.log(input.getAttribute('value'));
05 });
When the user clicks the button, the output is always "Hello".
What needs to be done to make this code work as expected?

A. Replace line 04 with console.log(input.value);
B. Replace line 02 with button.addCallback("click", function() {
C. Replace line 02 with button.addEventListener("onclick", function() {
D. Replace line 03 with const input = document.getElementByIdName('input');

Answer: A

Explanation:
getAttribute('value')
This returns the initial HTML attribute, not the live, updated value.
Even if the user edits the text, the value attribute remains "Hello" because HTML attributes do not update dynamically.
Input elements have a property value that always reflects the live current text inside the field.
So:
input.value
returns the user-entered value.
Therefore, line 04 must use the property, not the attribute:
console.log(input.value);
This ensures the updated input value is displayed.
JavaScript knowledge references (text-only)
HTML attributes are static and retrieved using getAttribute().
DOM element properties (like value) represent the current live state.
Input value changes update the .value property, not the attribute.

NEW QUESTION # 91
Refer to code below:
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 the result after line 10 executes?

A. Error: myFather.job is not a function
B. John undefined
C. John Developer
D. Undefined Developer

Answer: A

NEW QUESTION # 92
Refer to the following object.

How can a developer access the fullName property for dog?

A. Dog, function, fullName
B. Dog, get,fullName
C. Dog.fullName
D. Dog.fullName ( )

Answer: C

NEW QUESTION # 93
Which two console logs outputs NaN ?
Choose 2 answers

A. console.log(10/ ''five);
B. console.log(parseInt('two'));
C. console.log(10/ Number('5'));
D. console.log(10/0);

Answer: A,B

NEW QUESTION # 94
......

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