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Salesforce JS-Dev-101 Exam Overview:

Certification Vendor:	Salesforce
Exam Name:	Salesforce Certified JavaScript Developer - Multiple Choice
Exam Number:	JS-Dev-101
Exam Duration:	105 minutes
Available Languages:	English, Japanese
Exam Price:	USD 200
Certificate Validity Period:	Does not expire; requires maintenance updates
Passing Score:	65%
Real Exam Qty:	60 scored + up to 5 unscored
Exam Format:	Multiple select, Multiple choice
Related Certifications:	Salesforce Certified Platform Developer I Salesforce Certified Developer
Recommended Training:	Trailhead JavaScript Developer I Certification Prep
Exam Registration:	Salesforce Certification Registration
Sample Questions:	Salesforce JS-Dev-101 Sample Questions
Exam Way:	Online proctored or onsite at authorized testing centers
Pre Condition:	No formal prerequisites; recommended: strong JavaScript fundamentals, ES6+ experience, web development familiarity
Official Syllabus URL:	https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101

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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
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	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
Topic 5	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 (Q117-Q122):

NEW QUESTION # 117
Refer to the code snippet:
01 let array = [1, 2, 3, 4, 4, 5, 4, 4];
02 for (let i = 0; i < array.length; i++) {
03 if (array[i] === 4) {
04 array.splice(i, 1);
05 i--;
06 }
07 }
What is the value of array after the code executes?

A. [1, 2, 3, 5]
B. [1, 2, 3, 4, 5, 4]
C. [1, 2, 3, 4, 4, 5, 4]
D. [1, 2, 3, 4, 5, 4, 4]

Answer: A

Explanation:
Comprehensive and Detailed
The loop removes every 4:
Start: [1, 2, 3, 4, 4, 5, 4, 4]
i=0 → 1 (no change)
i=1 → 2 (no change)
i=2 → 3 (no change)
i=3 → 4 → splice removes index 3 → [1,2,3,4,5,4,4], then i-- → 2
Next loop, i=3 → 4 again → splice → [1,2,3,5,4,4], i-- → 2
i=3 → 5 (no change)
i=4 → 4 → splice → [1,2,3,5,4], i-- → 3
i=4 → 4 → splice → [1,2,3,5], i-- → 3
Next i=4, array.length is 4 → loop ends.
All 4s removed, final array: [1, 2, 3, 5].
________________________________________

NEW QUESTION # 118
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. 1.1.4
B. 2.0.0
C. 1.2.0
D. 1.2.3

Answer: B

NEW QUESTION # 119
A developer is trying to convince management that their team will benefit from using Node.js for a backend server that they are going to create. The server will be a web server that handles API requests from a website that the team has already built using HTML, CSS, and JavaScript.
Which three benefits of Node.js can the developer use to persuade their manager?
Choose 3 answers

A. Executes server-side JavaScript code to avoid learning a new language.
B. Installs with its own package manager to install and manage third-party libraries.
C. Uses non-blocking functionality for performant request handling.
D. Ensures stability with one major release every few years.
E. Performs a static analysis on code before execution to look for runtime errors.

Answer: A,B,C

NEW QUESTION # 120
A team at Universal Containers works on a big project and uses Yarn to deal with the project's dependencies. A developer added a dependency to manipulate dates and pushed the updates to the remote repository. The rest of the team complains that the dependency does not get downloaded when they execute yarn.
What could be the reason for this?

A. The developer missed the option --add when adding the dependency.
B. The developer added the dependency as a dev dependency, and YARN_ENV is set to production.
C. The developer missed the option --save when adding the dependency.
D. The developer added the dependency as a dev dependency, and NODE_ENV is set to production.

Answer: D

Explanation:
If the dependency was added as a dev dependency (yarn add --dev), it goes into devDependencies.
When NODE_ENV=production, Yarn (and npm) typically skip devDependencies on install.
Thus the package doesn't get installed for other team members in a production environment.
YARN_ENV is not a standard variable, --save is npm syntax (and Yarn saves by default), and --add is not how Yarn works (the command itself is yarn add).
________________________________________

NEW QUESTION # 121
A developer executes:
document.cookie;
document.cookie = 'key=John Smith';
What is the behavior?

A. Cookies are not read because line 01 should be document.cookies, but the key value is set and all cookies are wiped.
B. Cookies are read and the key value is set, the remaining cookies are unaffected.
C. Cookies are read and the key value is set, and all cookies are wiped.
D. Cookies are read, but the key value is not set because the value is not URL encoded.

Answer: B

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge document.cookie retrieves the cookie string.
Setting document.cookie = 'key=John Smith' adds or updates only that one cookie.
Important details:
Writing to document.cookie does not overwrite all cookies.
The browser does not require URL encoding, though it is recommended. Non-encoded spaces are allowed and automatically handled.
document.cookies does not exist; the correct property is document.cookie.
Therefore, the correct behavior:
Cookies are read.
A new cookie key=John Smith is set.
Existing cookies remain.
________________________________________
JavaScript Knowledge Reference (text-only)
Writing document.cookie appends or updates cookies, not replaces them.
document.cookie is both getter and setter for cookie strings.

NEW QUESTION # 122
......

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