Salesforce JavaScript-Developer-I Dumps with Practice Test Questions [2026]

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Salesforce JavaScript-Developer-I Exam covers various topics, including JavaScript, Lightning Web Components, Apex, and Visualforce. JavaScript-Developer-I exam evaluates the candidate's ability to create custom applications on the Salesforce platform using JavaScript, build custom user interfaces using Lightning Web Components, and integrate Salesforce with external systems using Apex and Visualforce. JavaScript-Developer-I exam also assesses the candidate's understanding of Salesforce development best practices and their ability to troubleshoot common issues that may arise during the development process.

Salesforce JavaScript-Developer-I Certification Exam is designed to test the skills and knowledge of individuals who wish to become Salesforce Certified JavaScript Developers. Salesforce Certified JavaScript Developer (JS-Dev-101) certification exam is ideal for developers who specialize in building custom applications on the Salesforce platform using JavaScript.

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Benefits in Obtaining Salesforce JavaScript-Developer-I Certification

With the introduction of the Lightning Experience by Salesforce, it is possible to develop cool, looking applications for a wide range of tasks. Admins have been able to create beautiful pages for their objects more than ever, with an interface entirely tailored for each user.For developers, the same application has never before been possible for Salesforce developers to create applications that stretch well beyond Salesforce's declarative features. It's all achieved with the use of a JavaScript application for Lightning & Lightning Web components.

The certification for JavaScript Developer I has just been released and fills a large gap in the certification list for Salesforce. Salesforce Developers who want to prove their Lightning skills, but also new entrants into the Salesforce community, are certified to demonstrate that they know what is relevant. A typical Salesforce 60 multi-choice test is split into two parts and is influenced by a super badge (Similar to Developer II certification).

Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q144-Q149):

NEW QUESTION # 144
Given the HTML below:
< div >
< div id= " row-uc " > Universal Containers < /div >
< div id= " row-as " > Applied Shipping < /div >
< div id= " row-bt " > Burlington Textiles < /div >
< /div >
Which statement adds the priority-account CSS class to the Applied Shipping row?

A. document.getElementById( ' row-as ' ).addClass( ' priority-account ' );
B. document.querySelector( ' #row-as ' ).classes.push( ' priority-account ' );
C. document.querySelector( ' #row-as ' ).classList.add( ' priority-account ' );
D. document.querySelectorAll( ' #row-as ' ).classList.add( ' priority-account ' );

Answer: C

Explanation:
* document.querySelector( ' #row-as ' ) returns the single element with id row-as.
* That element has a classList property with add, remove, etc.
Correct usage:
document.querySelector( ' #row-as ' ).classList.add( ' priority-account ' ); Why others are wrong:
* A: querySelectorAll returns a NodeList, not a single element, so it does not have a classList property.
* C: DOM elements do not have a classes array or push; they have classList.
* D: document.getElementById( ' row-as ' ) is fine to get the element, but there is no addClass method in standard DOM; that's a jQuery-style API, not vanilla JS.

NEW QUESTION # 145
Refer to the string below.
Const str='Salesforce';
Which two statements results in the word 'Sales'?

Answer:

Explanation:
See the Answer below in explanation:
Explanation
Str.substring(0,5);
Str.substr(0,5);

NEW QUESTION # 146
The developer has a function that prints "Hello" to an input name. To test this,thedeveloper created a function that returns "World". However the following snippet does not print " Hello World".

What can the developer do to change the code to print "Hello World" ?

A. Change line 2 to console.log('Hello' ,name() );
B. Change line 5 to function world ( ) {
C. Change line 7 to ) () ;
D. Change line 9 to sayHello(world) ();

Answer: A

NEW QUESTION # 147
A developer wants to use a try...catch statement to catch any error that countSheep () may throw and pass it to a handleError () function.
What is the correct implementation of the try...catch?

Answer: C

NEW QUESTION # 148
The developer wants to test this code:
Const toNumber =(strOrNum) => strOrNum;
Which two tests are most accurate for this code?
Choose 2 answers

A. console.assert(Number.isNaN(toNumber()));
B. console.assert(toNumber('-3') < 0);
C. console.assert(toNumber('2') === 2);
D. console.assert(toNumber () === NaN);

Answer: B,C

NEW QUESTION # 149
......

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