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| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I Exam |
| Exam Number: | JS-Dev-101 / JavaScript-Developer-I |
| Real Exam Qty: | 60 scored + up to 5 unscored |
| Related Certifications: | Salesforce Certified Lightning Web Components Specialist Salesforce Certified Platform Developer I |
| Available Languages: | Japanese, English |
| Exam Format: | Multiple-choice, Multiple-select |
| Passing Score: | 65% |
| Exam Duration: | 105 minutes |
| Certificate Validity Period: | No expiration; requires regular maintenance via Trailhead modules |
| Exam Price: | USD 200 (+ applicable taxes) |
| Recommended Training: | Salesforce JavaScript Developer I Certification Prep |
| Exam Registration: | Salesforce Certification Registration |
| Sample Questions: | Salesforce JavaScript-Developer-I Sample Questions |
| Exam Way: | Online proctored or onsite at authorized testing centers |
| Pre Condition: | No formal prerequisites; 1–2 years of JavaScript development experience recommended |
| Official Syllabus URL: | https://trailhead.salesforce.com/credentials/javascript-developer-i |
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To prepare for the Salesforce JavaScript-Developer-I Exam, candidates must have a strong understanding of JavaScript programming concepts, including data types, functions, events, and objects. They should also have knowledge of the Salesforce platform, including Apex, Visualforce, and Lightning Components. Candidates can also take the Salesforce JavaScript Developer I certification training course to gain the necessary skills and knowledge to pass the exam.
NEW QUESTION # 58
A team that works on a big project uses npm to deal with projects dependencies.
A developer added a dependency does not get downloaded when they execute npm install.
Which two reasons could be possible explanations for this?
Choose 2 answers
Answer: B,C,D
NEW QUESTION # 59
Given the following code:
What is the output of line 02?
Answer: A
NEW QUESTION # 60
Refer to the code below:
new Promise((resolve, reject) => {
const fraction = Math.random();
if( fraction >0.5) reject("fraction > 0.5, " + fraction);
resolve(fraction);
})
.then(() =>console.log("resolved"))
.catch((error) => console.error(error))
.finally(() => console.log(" when am I called?"));
When does Promise.finally on line 08 get called?
Answer: D
NEW QUESTION # 61
Refer to the code:
01 const exec = (item, delay) = >
02 new Promise(resolve = > setTimeout(() = > resolve(item), delay));
03
04 async function runParallel() {
05 const [result1, result2, result3] = await Promise.all(
06 [exec( ' x ' , ' 100 ' ), exec( ' y ' , ' 500 ' ), exec( ' z ' , ' 100 ' )]
07 );
08 return `parallel is done: ${result1}${result2}${result3}`;
09 }
Which two statements correctly execute runParallel()?
Answer: A,B
Explanation:
Facts about JavaScript Promises:
* runParallel() is declared async, which means it always returns a Promise .
* Promises are consumed using .then(), .catch(), and .finally().
* There is no .done() method in native JavaScript Promises.
* The async keyword cannot be placed before a function call (option A is invalid syntax).
Analysis of each option:
A). async runParallel().then(data);
Invalid syntax. async cannot prefix an expression.
B). Valid. Calls the function and attaches a .then() handler.
C). Invalid. .done() is not part of JavaScript Promise API.
D). Valid. Calls runParallel() and chains .then().
Therefore the correct answers are B and D.
JavaScript Knowledge References (text-only)
* async functions return Promises.
* Promises use .then() to retrieve resolved values.
* .done() is not part of the standard Promise interface.
NEW QUESTION # 62
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?
Answer: B
NEW QUESTION # 63
......
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