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Salesforce JavaScript-Developer-I Exam : Salesforce Certified JavaScript Developer (JS-Dev-101)
About Salesforce JavaScript-Developer-I Exam
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).
What is the duration, language, and format of Salesforce JavaScript-Developer-I Exam
- The type of questions is Multiple Choice and situation-based questions.
- There is a time limit of 105 minutes for the exam.
- This exam is offered in only English.
- This exam consists of 60 questions
- Passing score 65%
Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
How to Prepare for Salesforce JavaScript Developer I Exam
Preparation Guide for Salesforce JavaScript Developer I Exam
Introduction
Salesforce is a solution for managing customer relationships that unite customers and companies. This is an interactive CRM platform that provides a single, shared view of every client in all the divisions including marketing, distribution, exchange, and operation. Provide the clients with the individual experience Salesforce demand 360 product via the Integrated CRM Platform. It delivers solid and related goods to boost marketing, revenue, exchange, operation, IT, and more. Salesforce is a digital cloud computing (SaaS) firm specializing in the management of client relationships (CRMs). There was a mistake. The app is now the number one of consumer satisfaction and allows organizations to track customer behavior, advertise to consumers, and more. Salesforce is common because it is bundled with features such as contact management, workflow development, task management, incentive monitoring, teamwork tools, customer experience tools, analytics, and interactive, smartphone dashboard.
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Who should take the Salesforce JavaScript-Developer-I Exam
This course is designed for Javascript developers starting on the Salesforce platform who require programming customizations on front-end and back-end. There are no prerequisites for Salesforce JavaScript Developer I Exam. Typical job roles that align to the Salesforce Certified JavaScript Developer I are as follows:
- Support engineer
- UI/UX Engineer
- Full stack developer
- Technical Project Manager
- Web application developer
- Technical Product Manager
- Salesforce developer
- Front end developer
- JavaScript programmer
- Software/backend developer
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Salesforce JavaScript-Developer-I Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| JavaScript Language Fundamentals | - Data types, variables, and operators - ES6+ syntax and features - Functions, scope, and closures |
| Salesforce Platform Integration | - Security considerations in Salesforce JavaScript - Calling Apex methods from JavaScript - Lightning Web Components (LWC) JavaScript usage |
| Asynchronous JavaScript | - Error handling in async workflows - Event loop and concurrency model - Promises and async/await |
| Testing and Debugging | - Debugging techniques and tools - Unit testing principles |
| Browser and DOM Interaction | - DOM manipulation and traversal - Event handling and propagation - Browser APIs (fetch, storage, timers) |
Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions:
Given the code below:
01 setCurrentUrl();
02 console.log( " The current URL is: " + url);
03
04 function setCurrentUrl() {
05 url = window.location.href;
06 }
What happens when the code executes?
- A. The url variable has local scope and line 02 throws an error.
- B. The url variable has global scope and line 02 throws an error.
- C. The url variable has global scope and line 02 executes correctly.
- D. The url variable has local scope and line 02 executes correctly.
Correct Answer: C 🗳️
Explanation: Only visible for ExamsReviews members. You can sign-up / login (it's free).
Refer to the code below (corrected to use a template literal on line 08):
01 let car1 = new Promise((_, reject) = >
02 setTimeout(reject, 2000, " Car 1 crashed in " )
03 );
04 let car2 = new Promise(resolve = >
05 setTimeout(resolve, 1500, " Car 2 completed " )
06 );
07 let car3 = new Promise(resolve = >
08 setTimeout(resolve, 3000, " Car 3 completed " )
09 );
10
11 Promise.race([car1, car2, car3])
12 .then(value = > {
13 let result = `${value} the race.`;
14 })
15 .catch(err = > {
16 console.log( " Race is cancelled. " , err);
17 });
What is the value of result when Promise.race executes?
- A. Car 2 completed the race.
- B. Car 1 crashed in the race.
- C. Race is cancelled.
- D. Car 3 completed the race.
Correct Answer: A 🗳️
Explanation: Only visible for ExamsReviews members. You can sign-up / login (it's free).
A developer wants to create a simple image upload using the File API.
HTML:
< input type= " file " onchange= " previewFile() " >
< img src= " " height= " 200 " alt= " Image preview... " / >
JavaScript:
01 function previewFile() {
02 const preview = document.querySelector( ' img ' );
03 const file = document.querySelector( ' input[type=file] ' ).files[0];
04 // line 4 code
05 reader.addEventListener( " load " , () = > {
06 preview.src = reader.result;
07 }, false);
08 // line 8 code
09 }
Which code in lines 04 and 08 allows the selected local image to be displayed?
- A. 04 const reader = new File();
08 if (file) reader.readAsDataURL(file); - B. 04 const reader = new FileReader();
08 if (file) reader.readAsDataURL(file); - C. 04 const reader = new FileReader();
08 if (file) URL.createObjectURL(file);
Correct Answer: B 🗳️
Explanation: Only visible for ExamsReviews members. You can sign-up / login (it's free).
A developer executes:
document.cookie;
document.cookie = ' key=John Smith ' ;
What is the behavior?
- A. Cookies are read and the key value is set, and all cookies are wiped.
- B. Cookies are read, but the key value is not set because the value is not URL encoded.
- C. Cookies are read and the key value is set, the remaining cookies are unaffected.
- D. Cookies are not read because line 01 should be document.cookies, but the key value is set and all cookies are wiped.
Correct Answer: C 🗳️
Refer to the code below:
flag();
function flag() {
console.log( ' flag ' );
}
const anotherFlag = () = > {
console.log( ' another flag ' );
}
anotherFlag();
What is result of the code block?
- A. An error is thrown.
- B. The console logs ' flag ' and then an error is thrown.
- C. The console logs only ' flag ' .
- D. The console logs ' flag ' and ' another flag ' .
Correct Answer: D 🗳️
Explanation: Only visible for ExamsReviews members. You can sign-up / login (it's free).
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