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Salesforce JS-Dev-101 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 2
  • Objects, Functions, and Classes: Covers function, object, and class implementations to meet business requirements, along with the use of modules, decorators, variable scope, and execution flow.
Topic 3
  • Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 4
  • Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
Topic 5
  • Variables, Types, and Collections: Covers declaring and initializing variables, working with strings, numbers, dates, arrays, and JSON, along with understanding type coercion and truthy
  • falsy evaluations.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q129-Q134):

NEW QUESTION # 129
Refer to the code below:
01 let first = 'Who';
02 let second = 'What';
03 try {
04 try {
05 throw new Error('Sad trombone');
06 } catch (err) {
07 first = 'Why';
08 throw err;
09 } finally {
10 second = 'When';
11 }
12 } catch (err) {
13 second = 'Where';
14 }
What are the values for first and second once the code executes?

Answer: D

Explanation:
Initial values:
first = 'Who'
second = 'What'
Execution:
Inner try/catch/finally:
Line 05: throw new Error('Sad trombone');
Control goes to the inner catch.
Inner catch (lines 06-08):
catch (err) {
first = 'Why';
throw err;
}
first is set to 'Why'.
The error is rethrown.
Inner finally (lines 09-11):
finally {
second = 'When';
}
finally runs whether or not there was an error.
second becomes 'When'.
After inner finally, the rethrown error continues to propagate to the outer catch.
Outer catch (lines 12-14):
} catch (err) {
second = 'Where';
}
Because the inner try rethrew, the outer catch runs.
It sets second = 'Where'.
Final values:
first was changed to 'Why' in the inner catch and never changed again.
second became 'When' in the inner finally, and then 'Where' in the outer catch.
So:
first is 'Why'
second is 'Where'
Option B is correct.
Concepts: nested try/catch/finally, rethrowing errors, order of execution for catch vs finally, variable mutation through error propagation.


NEW QUESTION # 130
A developer wants to advocate for a mature, well-supported web framework/library instead of a new one (Minimalist.js).
Which two should be recommended?

Answer: B,D

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge React and Vue are:
Mature front-end JavaScript frameworks/libraries.
Have large communities.
Are widely supported and used in production across industries.
Appropriate for building browser-based Single Page Applications.
Express and Koa are server-side frameworks, not front-end SPA frameworks.
The scenario describes building a browser SPA, so the correct seasoned options are React and Vue.
________________________________________
JavaScript Knowledge Reference (text-only)
React and Vue are client-side frameworks for SPA development.
Express and Koa are backend frameworks for Node.js.


NEW QUESTION # 131
A page loads 50+ <div class="ad-library-item"> elements, all ads.
Developer wants to quickly and temporarily remove them.
Options:

Answer: B

Explanation:
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 # 132
A developer has two ways to write a function:
Option A:
01 function Monster() {
02 this.growl = () => {
03 console.log("Grr!");
04 }
05 }
Option B:
01 function Monster() {};
02 Monster.prototype.growl = () => {
03 console.log("Grr!");
04 }
After deciding on an option, the developer creates 1000 monster objects. How many growl methods are created with Option A and Option B?

Answer: B

Explanation:
Option A:
this.growl = () => { ... } inside the constructor creates a new function per instance.
For 1000 new Monster(), you get 1000 distinct growl functions, each stored on the instance itself.
Option B:
Monster.prototype.growl = () => { ... } attaches growl to the prototype.
All instances share the same single growl function via the prototype chain.
For 1000 instances, only 1 growl method exists in memory.
So: Option A → 1000; Option B → 1.
________________________________________


NEW QUESTION # 133
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?

Answer: C


NEW QUESTION # 134
......

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