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Salesforce Certified JavaScript Developer I exam is a computer-based test that consists of 60 multiple-choice questions that the candidates need to complete within 105 minutes. JavaScript-Developer-I exam is designed to assess the candidate's understanding of the key aspects of JavaScript development on the Salesforce platform, including the architecture of Salesforce Lightning, the Apex programming language, and the use of Visualforce and other web technologies.

Salesforce JavaScript-Developer-I Certification Exam is an essential certification for developers who want to demonstrate their expertise in JavaScript development in the Salesforce platform. Passing JavaScript-Developer-I Exam not only validates the candidate's skills and knowledge but also opens up new career opportunities in the Salesforce ecosystem. Candidates who pursue this certification will gain valuable experience and knowledge that will help them succeed in their careers as Salesforce developers.

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Free PDF 2026 Salesforce High Pass-Rate JavaScript-Developer-I: Salesforce Certified JavaScript Developer (JS-Dev-101) Exam Vce

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q147-Q152):

NEW QUESTION # 147
A developer is setting up a Node.js server and is creating a script at the root of the source code, index.js, that will start the server when executed. The developer declares a variable that needs the folder location that the code executes from.
Which global variable can be used in the script?

A. this.path
B. window.location
C. __dirname
D. __filename

Answer: C

Explanation:
In Node.js:
* __filename is the absolute path to the current file (including file name).
* __dirname is the absolute path to the directory that contains the current file.
* window.location is a browser-only global, not available in Node.js.
* this.path is not a standard Node.js global for path information.
The requirement is:
"the folder location that the code executes from."
That is exactly what __dirname provides.
So the correct choice is __dirname.
Concepts: Node.js globals, __filename, __dirname, Node vs browser environment.

NEW QUESTION # 148
Refer to the code below:
Async funct on functionUnderTest(isOK) {
If (isOK) return 'OK' ;
Throw new Error('not OK');
)
Which assertion accurately tests the above code?

A. Console.assert (await functionUnderTest(true), 'OK')
B. Console.assert (await functionUnderTest(true), ' OK ')
C. Console.assert (await functionUnderTest(true), ' not OK ')
D. Console.assert (await functionUnderTest(true), ' not OK ')

Answer: A

NEW QUESTION # 149
Teams at Universal Containers (UC) work on multiple JavaScript projects at the same time.
UC is thinking about reusability and how each team can benefit from the work of others.
Going open-source or public is not an option at this time.
Which option is available to UC with npm?

A. Private packages can be scored, and scopes can be associated to a private
registries.
B. Private packages are not supported, but they can use another package manager like
yarn.
C. Private registries are not supported by npm, but packages can be installed via git.
D. Private registries are not supported by npm, but packages can be installed via URL.

Answer: A

NEW QUESTION # 150
Refer to the followingcode:

A. Outer message
Inner message
B. Outer message
C. Inner message
Outer message
D. Button message

Answer: D

NEW QUESTION # 151
Refer to the code below:
01 const objBook = {
02 title: ' JavaScript ' ,
03 };
04 Object.preventExtensions(objBook);
05 const newObjBook = objBook;
06 newObjBook.author = ' Robert ' ;
What are the values of objBook and newObjBook respectively?

A. { author: " Robert " , title: " JavaScript " }
{ author: " Robert " , title: " JavaScript " }
B. { title: " JavaScript " }
{ title: " JavaScript " }
C. { author: " Robert " }
{ author: " Robert " , title: " JavaScript " }
D. { author: " Robert " , title: " JavaScript " }
undefined

Answer: B

Explanation:
* Object.preventExtensions(obj) This built-in JavaScript method marks an object so that no new properties can be added to it. Existing properties can still be read and updated, but adding new ones is disallowed.
* const newObjBook = objBook; Both variables reference the same object in memory. JavaScript objects are assigned by reference, not copied.
* newObjBook.author = " Robert " ; Because the object has been marked as non-extensible, JavaScript will not allow new properties to be added. The behavior depends on mode:
* In non-strict mode: the assignment silently fails and does nothing.
* In strict mode: this would throw a TypeError.
Since nothing indicates strict mode, this is non-strict behavior, making the assignment fail silently.
Therefore, the object remains:
{ title: " JavaScript " }
Both objBook and newObjBook point to the same unchanged object.
This matches option A.
JavaScript knowledge references (text-only)
* Object.preventExtensions() prevents adding new properties.
* Assigning an object to another variable copies the reference, not the object.
* Adding a property to a non-extensible object silently fails in non-strict mode.

NEW QUESTION # 152
......

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