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Salesforce JS-Dev-101 Exam Syllabus Topics:

Section	Objectives
Topic 1: Browser and DOM Interaction	- Events and Event Handling - DOM Manipulation
Topic 2: Asynchronous Programming	- Callbacks, Promises, and Async/Await - API Calls and Data Fetching
Topic 3: Object-Oriented JavaScript	- Classes and Inheritance - Objects and Prototypes
Topic 4: Salesforce Platform Integration	- Working with Salesforce Data Models - Lightning Web Components (LWC) Basics
Topic 5: JavaScript Fundamentals	- Control Flow and Error Handling - Functions and Scope - Variables, Data Types, and Operators

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Salesforce Certified JavaScript Developer - Multiple Choice JS-Dev-101 Prüfungsfragen mit Lösungen (Q106-Q111):

106. Frage
Given the following code:
document.body.addEventListener(' click ', (event) => {
if (/* CODE REPLACEMENT HERE */) {
console.log('button clicked!');
)
});
Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a button on page is clicked?

A. button.addEventListener('click')
B. Event.clicked
C. e.nodeTarget ==this
D. event.target.nodeName == 'BUTTON'

Antwort: D

107. Frage
Refer to the following object.
```javascript
02 const dog = {
02 firstName: 'Beau',
03 lastName: 'Boo',
04 get fullName() {
05 return this.firstName + ' ' + this.lastName;
06 }
07 };
How can a developer access the fullName property for dog?

A. dog.fullName()
B. dog.fullName
C. dog.get.fullName
D. dog.function.fullName()

Antwort: B

108. Frage
Refer to the following code (correcting the missing template literal backticks):
let codeName = 'Bond';
let sampleText = `The name is ${codeName}, Jim ${codeName}`;
A developer is trying to determine if a certain substring is part of a string.
Which three code statements return true?

A. sampleText.includes('Jim', 4);
B. sampleText.includes('The', 1);
C. sampleText.indexOf('Bond') !== -1;
D. sampleText.includes('Jim');
E. sampleText.substring('Jim');

Antwort: A,C,D

Begründung:
First, compute sampleText:
let codeName = 'Bond';
let sampleText = `The name is ${codeName}, Jim ${codeName}`;
The template literal evaluates to:
"The name is Bond, Jim Bond"
Now evaluate each statement:
Option A: sampleText.includes('Jim');
String.prototype.includes(substring) returns true if substring occurs anywhere in the string.
sampleText clearly contains "Jim" ("The name is Bond, Jim Bond").
So this returns true.
Option B: sampleText.includes('The', 1);
includes(searchString, position) starts searching from the given position index.
"The name is Bond, Jim Bond" has "The" starting at index 0.
Starting search at index 1 means "The" at index 0 is not considered, and there is no second "The".
So this returns false.
Option C: sampleText.includes('Jim', 4);
"Jim" appears after "The name is Bond, " which is longer than 4 characters; the index of "Jim" is well past 4.
So when searching from index 4, "Jim" is still found.
This returns true.
Option D: sampleText.indexOf('Bond') !== -1;
String.prototype.indexOf(substring) returns:
-1 if the substring is not found,
Otherwise, the starting index of the first occurrence.
"Bond" appears twice in "The name is Bond, Jim Bond".
So sampleText.indexOf('Bond') is some non-negative index (for the first occurrence).
Therefore indexOf('Bond') !== -1 is true.
Option E: sampleText.substring('Jim');
substring expects numeric indexes: substring(startIndex, endIndex?).
If given a string "Jim" as the argument, JavaScript coerces it to a number:
Number('Jim') → NaN
NaN for startIndex is treated as 0.
So sampleText.substring('Jim') is effectively sampleText.substring(0), which returns the full string "The name is Bond, Jim Bond".
This is a string, not a boolean. The question asks "which code statements return true?" This statement returns a string, not the boolean value true.
Thus, the three statements that actually return true (boolean) are:
Answe r: A, C, D
Study Guide / Concept Reference (no links):
Template literals and ${} interpolation
String.prototype.includes(searchString, position?)
String.prototype.indexOf(substring) and checking for !== -1
String.prototype.substring(start, end?) and argument coercion
Boolean vs non-boolean return types in string methods

109. Frage
Refer to the following code:

Which statement should be added to line 09 for the code to display. The boat has a capacity of 10 people?

A. this.size = size;
B. ship.size size;
C. super (size);
D. super.size = size;

Antwort: A

110. Frage
Original code:
01 let requestPromise = client.getRequest;
03 requestPromise().then((response) => {
04 handleResponse(response);
05 });
The developer wants to gracefully handle errors from a Promise-based GET request.
Which code modification is correct?

A. Use finally handler for errors
B. (duplicate of A)
C. try/catch around requestPromise().then(...)
D. Add .catch to the Promise chain

Antwort: D

Begründung:
Key JavaScript Promise rule:
try...catch does not catch asynchronous errors that occur in Promise chains.
Therefore, the correct way to handle errors in a Promise is:
promise.then(...).catch(...);
Analysis of options:
A and B:
Both wrap asynchronous code in try...catch, which does not catch Promise rejections.
try...catch only catches errors thrown synchronously inside the block.
C:
Correct. A .catch() on the Promise chain handles any error from the Promise returned by requestPromise().
D:
.finally() executes regardless of success or failure, but it does not receive the error object, so it cannot handle the error.
Thus the only valid solution is option C.
JavaScript Knowledge Reference (text-only)
Promise rejections must be handled with .catch().
try...catch only handles synchronous code.
.finally() does not receive a rejection reason.

111. Frage
......

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