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Salesforce JavaScript-Developer-I Exam Overview:

Certification Vendor:	Salesforce
Exam Name:	Salesforce Certified JavaScript Developer I
Exam Number:	JS-Dev-101
Real Exam Qty:	60 (plus up to 5 unscored pilot questions)
Related Certifications:	Salesforce Certified JavaScript Developer I Credential
Certificate Validity Period:	None (Credential does not expire)
Passing Score:	65%
Exam Price:	$200 USD
Exam Duration:	105 minutes
Exam Format:	Multiple-select, Multiple-choice
Available Languages:	English
Sample Questions:	Salesforce JavaScript-Developer-I Sample Questions
Exam Way:	Online (proctored via Pearson VUE) or On-site (at a Pearson VUE testing center)
Pre Condition:	None required. 1-2 years of JavaScript development experience (front-end and/or back-end) is strongly recommended. Note: To earn the full credential, candidates must also pass the Lightning Web Components Specialist Superbadge in addition to the JS-Dev-101 exam.
Official Syllabus URL:	https://trailhead.salesforce.com/en/credentials/javascriptdeveloperi

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To pass the Salesforce Certified JavaScript Developer I exam, candidates need to have a sound understanding of JavaScript programming language and its applications in the Salesforce platform. JavaScript-Developer-I Exam consists of 60 multiple-choice questions and requires a passing score of 68%. JavaScript-Developer-I exam can be taken online, and the candidates have 105 minutes to complete it.

Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q36-Q41):

NEW QUESTION # 36
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.querySelector( ' #row-as ' ).classList.add( ' priority-account ' );
B. document.querySelector( ' #row-as ' ).classes.push( ' priority-account ' );
C. document.getElementById( ' row-as ' ).addClass( ' priority-account ' );
D. document.querySelectorAll( ' #row-as ' ).classList.add( ' priority-account ' );

Answer: A

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 # 37
Refer to the following object.

How can a developer access the fullName property for dog?

A. Dog.fullName ( )
B. Dog, get, fullName
C. Dog, function, fullName
D. Dog.fullName

Answer: D

NEW QUESTION # 38
Given code below:
setTimeout (() => (
console.log(1);
). 0);
console.log(2);
New Promise ((resolve, reject )) = > (
setTimeout(() => (
reject(console.log(3));
). 1000);
)).catch(() => (
console.log(4);
));
console.log(5);
What is logged to the console?

A. 1 2 5 3 4
B. 2 5 1 3 4
C. 2 1 4 3 5
D. 1 2 4 3 5

Answer: B

NEW QUESTION # 39
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?

A. 1000 growl methods are created for Option A. 1 growl method is created for Option B.
B. 1000 growl methods are created regardless of which option is used.
C. 1 growl method is created regardless of which option is used.
D. 1 growl method is created for Option A. 1000 growl methods are created for Option B.

Answer: A

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 # 40
Refer to the following code:

What is the value of output on line 11?

A. [''foo'', ''bar'']
B. An error will occur due to the incorrect usage of the for...of statement on line 07.
C. [1, 2]
D. [''foo'':1, ''bar'':2'']

Answer: B

NEW QUESTION # 41
......

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