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Salesforce JS-Dev-101 Exam Overview:

Certification Vendor:	Salesforce
Exam Name:	Salesforce Certified JavaScript Developer I
Exam Number:	JS-Dev-101
Available Languages:	English
Passing Score:	65%
Real Exam Qty:	60 (plus up to 5 unscored pilot questions)
Exam Format:	Multiple Select, Multiple Choice
Exam Duration:	105 minutes
Exam Price:	$200 USD
Certificate Validity Period:	Lifetime (No renewal required)
Related Certifications:	Lightning Web Components Specialist Superbadge Salesforce Certified JavaScript Developer I
Sample Questions:	Salesforce JS-Dev-101 Sample Questions
Exam Way:	Online (Proctored)
Pre Condition:	Completion of the Lightning Web Components Specialist Superbadge is required to earn the full credential, though it can be completed before or after the exam.
Official Syllabus URL:	https://trailhead.salesforce.com/en/credentials/javascriptdeveloperi

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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	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.
Topic 2	Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Topic 3	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 4	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Topic 5	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 6	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.

Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q12-Q17):

NEW QUESTION # 12
A developer creates a class that represents a blog post based on the requirement that a Post should have a body author and view count.
The Code shown Below:
Class Post{
// Insert code here
This.body =body
This.author = author;
this.viewCount = viewCount;
}
}
Which statement should be inserted in the placeholder on line 02 to allow for a variable to be set to a new instanceof a Post with the three attributes correctly populated?

A. constructor (body, author, viewCount) {
B. constructor() {
C. Function Post (body, author, viewCount) {
D. super (body, author, viewCount) {

Answer: A

NEW QUESTION # 13
Given the JavaScript below:

Which code should replace the placeholder comment on line 06 to hide accounts that do not match the search string?

A. 'None' : 'block'
B. 'Visible : 'hidden'
C. 'Block' : 'none'
D. 'Hidden, visible

Answer: C

NEW QUESTION # 14
Which option is true about the strict mode in imported modules?

A. Imported modules are in strict mode whether you declare them as such or not.
B. Add the statement use strict = false; before any other statements in the module to enable notstrict mode.
C. Add the statement use non-strict; before any other statements in the module to enable notstrict mode.
D. A developer can only reference notStrict() functions from the imported module.

Answer: A

Explanation:
In JavaScript, ES modules (files imported using import / export) have special semantics:
All code inside a module is automatically executed in strict mode.
This is specified by the ECMAScript standard and does not require the explicit "use strict"; directive.
Effects:
You do not need to write "use strict"; at the top of a module file.
You cannot turn strict mode off for module code.
All module top-level code is treated as strict.
Now evaluate each option:
Option A:
Add the statement use non-strict; before any other statements in the module to enable notstrict mode.
There is no use non-strict; directive in JavaScript.
The only directive recognized by engines is "use strict";.
You cannot explicitly enable a "non-strict" mode with such a string.
Option B:
Imported modules are in strict mode whether you declare them as such or not.
This matches the language specification.
ES modules are always in strict mode, automatically.
This is true.
Option C:
Add the statement use strict = false; before any other statements in the module to enable notstrict mode.
use strict = false; is not a directive; it is parsed as a normal expression, and does not affect strict mode.
There is no supported way to disable strict mode in modules.
Option D:
A developer can only reference notStrict() functions from the imported module.
There is no special notStrict() restriction in modules.
Functions exported/imported in modules are simply subject to strict mode rules like the rest of the module's code.
Therefore, the only correct statement is:
Answe r: B
Study Guide / Concept Reference (no links):
ES modules (import / export)
Automatic strict mode in modules
"use strict"; directive for scripts vs modules
Inability to disable strict mode in ES module code

NEW QUESTION # 15
Value of:
true + 3 + '100' + null

A. "4100null"
B. 0
C. "4100"
D. "2200null"

Answer: A

Explanation:
The correct answer is A.
JavaScript evaluates the expression from left to right:
true + 3 + '100' + null
Step 1:
true + 3
In numeric addition, true is converted to:
1
So:
true + 3
becomes:
1 + 3
Result:
4
Step 2:
4 + '100'
Because one operand is a string, JavaScript performs string concatenation instead of numeric addition.
So:
4 + '100'
becomes:
"4100"
Step 3:
"4100" + null
Again, because one operand is already a string, JavaScript converts null into the string:
"null"
So the final result is:
"4100null"
Execution summary:
true + 3 + '100' + null
// 1 + 3 + '100' + null
// 4 + '100' + null
// "4100" + null
// "4100null"
Therefore, the verified answer is A.

NEW QUESTION # 16
developer publishes a new version of a package with new features that do not break backward compatibility. The previous version number was 1.1.3.
Following semantic versioning format, what should the new package version number be?

A. 1.2.0
B. 1.1.4
C. 2.0.0
D. 1.2.3

Answer: C

NEW QUESTION # 17
......

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