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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)
Passing Score:	65%
Related Certifications:	Salesforce Certified JavaScript Developer I Credential
Exam Duration:	105 minutes
Exam Format:	Multiple-select, Multiple-choice
Certificate Validity Period:	None (Credential does not expire)
Exam Price:	$200 USD
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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Salesforce JavaScript-Developer-I (Salesforce Certified JavaScript Developer I) Exam is a certification exam designed for developers who want to demonstrate their proficiency in developing client-side JavaScript applications using the Salesforce platform. JavaScript-Developer-I Exam is highly recommended for those who are interested in pursuing a career in Salesforce development as it is a key requirement for many job positions in the field.

Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q34-Q39):

NEW QUESTION # 34
Refer to the code below:
const event = new CustomEvent(
//Missing Code
);
obj.dispatchEvent(event);
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options could a developer insert at the placeholder in line 02 to achieve this?
Choose 2 answers

A. 'Update' , {
Details : {
recordId : '123abc'
B. 'Update' , (
recordId : '123abc'
(
C. 'Update' , '123abc'
D. { type : 'update', recordId : '123abc' }

Answer: A,B

Explanation:
}
}

NEW QUESTION # 35
A developer wants to catch any error that countSheep() may throw and pass it to handleError().
Which implementation is correct?

A. setTimeout(function() {
try {
(Answer incomplete in option list.)
B. try {
setTimeout(function() {
countSheep();
}, 1000);
}
catch (e) {
handleError(e);
}
C. try {
countSheep();
} finally {
handleError(e);
}
D. try {
countSheep();
} handleError(e) {
catch(e);
}

Answer: B

Explanation:
Key JavaScript knowledge:
* try...catch catches synchronous errors that occur inside the try block.
* Errors thrown asynchronously (e.g., inside a timer callback) cannot be caught by surrounding synchronous try...catch unless the try...catch is inside the callback.
* Option A places countSheep() inside the callback but the try...catch is outside the asynchronous function. However, this is the only syntactically valid answer among the provided choices. Since the question wants the correct structure based on options provided, A is the only complete and valid try...
catch.
Options B, C, and D are syntactically invalid:
* B: finally always executes but does not catch the error. Also uses an undefined variable e.
* C: Does not follow valid JavaScript grammar.
* D: The provided option is incomplete and cannot be correct.
Thus, A is the only valid surrounding structure in the provided choices.
JavaScript Knowledge References (text-only)
* try...catch syntax must be correctly structured.
* finally does not catch errors.
* try { } catch (e) { } is valid only when complete and correctly ordered.

NEW QUESTION # 36
A developer has code that calculates a restaurant bill, but generates incorrect answers while testing the code:
function calculateBill (items ){
let total = 0;
total += findSubTotal(items);
total += addTax(total);
total += addTip(total);
return total;
}
Which option allows the developer to step into each function execution within calculateBill?

A. Usingthe debugger command on line 03
B. Calling the console.trace (total) method on line 03.
C. Wrapping findSubtotal in a console.log() method.
D. Using the debugger command on line 05.

Answer: D

NEW QUESTION # 37
A developer has a web server running with Node.js. The command to start the web server is node server.js. The web server started having latency issues. Instead of a one second turnaround for web requests, the developer now sees a five second turnaround.
Which command can the web developer run to see what the module is doing during the latency period?

A. NODE_DEBUG=http,https node server.js
B. DEBUG=true node server.js
C. NODE_DEBUG=true node server.js
D. DEBUG=http, https node server.js

Answer: B

NEW QUESTION # 38
Refer to the code below:
Const searchTest = 'Yay! Salesforce is amazing!" ;
Let result1 = searchText.search(/sales/i);
Let result 21 = searchText.search(/sales/i);
console.log(result1);
console.log(result2);
After running this code, which result is displayed on the console?

A. > 5 >undefined
B. > 5 > 0
C. > true > false
D. > 5 > -1

Answer: A

Explanation:

NEW QUESTION # 39
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