Pass Guaranteed Quiz Salesforce - JS-Dev-101 - Professional Exam Salesforce Certified JavaScript Developer - Multiple Choice Actual Tests

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Salesforce JS-Dev-101 Exam Syllabus Topics:

Section Weight Objectives
Topic 1: Objects, Functions, and Classes 25% - ES6 classes, inheritance, modules, decorators
- Function types, scope, closures, arrow functions
- Object creation, properties, prototypes
Topic 2: Variables, Types, and Collections 23% - Data types, type coercion, truthy/falsy values
- JSON parsing and manipulation
- Strings, numbers, dates, arrays and methods
- Variable declaration and scope
Topic 3: Testing 7% - Unit test structure and effectiveness
- Test coverage and improvement
Topic 4: Asynchronous Programming 13% - Callbacks, promises, async/await
- Event loop and execution flow
Topic 5: Debugging and Error Handling 7% - Error types and handling strategies
- Console usage, breakpoints and debugging techniques
Topic 6: Server Side JavaScript 8% - Package management and CLI tools
- Node.js fundamentals and core modules
Topic 7: Browser and Events 17% - Browser APIs and developer tools
- Event handling, propagation, listeners
- DOM selection and manipulation

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q37-Q42):

NEW QUESTION # 37
Refer to the code below:
```html
<html>
<body>
<div id="logo">Hello Logo!</div>
<button id="test">Click me</button>
</body>
<script>
function printMessage() {
console.log('This is a test message');
}
let el = document.getElementById('test');
el.addEventListener("click", printMessage, false);
</script>
</html>

  • A. Add event. removetventiistener(); tO printlessage function
  • B. Add event. stopPropagation(); 10 printivessage function
  • C. Add event.stoppropagation(); to winontdoado evewnt handier
  • D. Add event. removefventListener(); 10 window. onLoad event handier

Answer: B


NEW QUESTION # 38
Refer to the code:

Given the code above, which three properties are set pet1? Choose 3 answers:

  • A. canTalk
  • B. Owner
  • C. Name
  • D. Size
  • E. Type

Answer: A,D,E


NEW QUESTION # 39
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('The', 1);
  • B. sampleText.includes('Jim');
  • C. sampleText.indexOf('Bond') !== -1;
  • D. sampleText.substring('Jim');
  • E. sampleText.includes('Jim', 4);

Answer: B,C,E

Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
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:
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
________________________________________


NEW QUESTION # 40
A page loads 50+ <div class="ad-library-item"> elements, all ads.
Developer wants to quickly and temporarily remove them.
Options:

  • A. Use the DOM inspector to remove all elements containing the class ad-library-item.
  • B. Use the browser console to execute a script that removes all elements containing the class ad-library-item.
  • C. Use the DOM inspector to prevent the load event from firing.
  • D. Use the browser console to execute a script that prevents the load event from firing.

Answer: B

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge The goal:
"Temporarily and quickly remove them."
The fastest way is to run a script in the browser console that removes all such elements:
document.querySelectorAll('.ad-library-item').forEach(el => el.remove()); This immediately removes all 50+ elements and requires no page reload.
Option analysis:
A & B: Preventing load events is unreliable and does not remove already-created DOM nodes.
C: Correct-console code can remove all matching DOM elements instantly.
D: Possible but extremely slow; removing 50+ elements one by one in the inspector is not "quick." Therefore, C is the best answer.
________________________________________
JavaScript Knowledge Reference (text-only)
The browser console can run arbitrary JavaScript that manipulates the DOM.
document.querySelectorAll() returns all matching DOM nodes.
Nodes can be removed using .remove().


NEW QUESTION # 41
developer removes the HTML class attribute from the checkout button, so now it is simply:
<button>Checkout</button>.
There is a test to verify the existence of the checkout button, however it looks fora button with class= "blue". The test fails because no such button is found.
Which type of test category describes this test?

  • A. True negative
  • B. True positive
  • C. False negative
  • D. False positive

Answer: C


NEW QUESTION # 42
......

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