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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q59-Q64):

NEW QUESTION # 59
Refer to the code below:
class Student {
constructor(name) {
this._name = name;
}
displayGrade() {
console.log(`${this._name} got 70% on test.`);
}
}
class GraduateStudent extends Student {
constructor(name) {
super(name);
this._name = " Graduate Student " + name;
}
displayGrade() {
console.log(`${this._name} got 100% on test.`);
}
}
let student = new GraduateStudent( " Jane " );
student.displayGrade();
What is the console output?

Answer: A

Explanation:
The correct answer is C , after correcting the option text to match the actual code.
The object is created here:
let student = new GraduateStudent( " Jane " );
Because GraduateStudent extends Student, its constructor runs:
constructor(name) {
super(name);
this._name = " Graduate Student " + name;
}
The call to:
super(name);
runs the parent Student constructor first and temporarily sets:
this._name = " Jane " ;
Then this line in the child constructor overwrites that value:
this._name = " Graduate Student " + name;
So the final value of this._name becomes:
" Graduate Student Jane "
Next, this line executes:
student.displayGrade();
Since student is an instance of GraduateStudent, JavaScript uses the overridden displayGrade() method from GraduateStudent, not the parent method from Student.
The executed method is:
displayGrade() {
console.log(`${this._name} got 100% on test.`);
}
Therefore, the console output is:
Graduate Student Jane got 100% on test.
Important correction: the original option C said something like " Better student Jackie got 100% on test. " , but the actual code uses " Graduate Student " and the name " Jane " . The verified corrected answer remains C
.


NEW QUESTION # 60
Given the expressions var1 and var2, what are two valid ways to return the concatenation of the two expressions and ensure it is string? Choose 2 answers

Answer: A,C


NEW QUESTION # 61
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

Answer: B,D

Explanation:
}
}


NEW QUESTION # 62
A developer writes the code below to return a message to a user attempting to register a new username. If the username is available, a variable named msg is declared and assigned a value on line 03.
function getAvailabilityMessage(item) {
if (getAvailability(item)) {
var msg = " Username available " ;
return msg;
}
}

Answer: B

Explanation:
The correct answer is C .
When getAvailability(item) returns true, the code inside the if block executes:
var msg = " Username available " ;
return msg;
The variable msg receives the string value:
" Username available "
Then that same value is returned from the function.
The key point is that var is function-scoped, not block-scoped. So msg belongs to the function scope of getAvailabilityMessage(). However, because the return msg; statement is inside the same if block, the function immediately returns the assigned string when the username is available.
Option A is incorrect because msg is defined before it is returned.
Option B is incorrect because " newUserName " is not assigned or returned anywhere in the function.
Option D would only happen if getAvailability(item) returned false, because then the function would finish without an explicit return value.
For the available username scenario, the verified answer is C .


NEW QUESTION # 63
A team that works on a big project uses npm to deal with projects dependencies.
A developer added a dependency does not get downloaded when they execute npm install.
Which two reasons could be possible explanations for this?
Choose 2 answers

Answer: A,C,D


NEW QUESTION # 64
......

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