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Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
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Salesforce JavaScript-Developer-I Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Server-Side JavaScript | 8% | - Node.js fundamentals and runtime - Command-line tools and scripts - Core Node.js modules - Module system and require/import |
| Topic 2: Variables, Types, and Collections | 23% | - Working with strings, numbers, dates, and booleans - Truthy and falsy values - Type coercion and conversion rules - Variable declaration and initialization - Array methods and data manipulation - JSON parsing and usage |
| Topic 3: Debugging and Error Handling | 7% | - Error types and exception handling - Console methods and logging - Debugging tools and breakpoints - Defensive programming practices |
| Topic 4: Objects, Functions, and Classes | 25% | - Closures and execution context - Class syntax, inheritance, and prototypes - Object creation, properties, and methods - Function definitions, parameters, and scope - Modules and imports/exports - Decorators and advanced function patterns |
| Topic 5: Asynchronous Programming | 13% | - Fetch API and HTTP requests - Callbacks and callback hell - Event loop and micro/macro tasks - Promises and chaining - Async/await syntax |
| Topic 6: Testing | 7% | - Unit testing concepts - Test doubles and mocks - Code coverage and best practices - Testing frameworks and assertions |
| Topic 7: Browsers and Events | 17% | - Browser APIs and Web Storage - Window and document object properties - Event handling, propagation, and delegation - Document Object Model (DOM) manipulation - Script loading and execution order |
Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions:
const str = ' Salesforce ' ;
Which two statements result in the word " Sales " ?
- A. str.substring(0, 5);
- B. str.substr(s, 5);
- C. str.substr(0, 5);
- D. str.substring(0, 5);
Correct Answer: C,D 🗳️
Explanation: Only visible for Prep4sureExam members. You can sign-up / login (it's free).
A developer initiates a server with the file server.js and adds dependencies in the source code ' s package.json that are required to run the server.
Which command should the developer run to start the server locally?
- A. npm start
- B. node start
- C. start server.js
- D. npm start server.js
Correct Answer: A 🗳️
Explanation: Only visible for Prep4sureExam members. You can sign-up / login (it's free).
Refer to the code:
01 const event = new CustomEvent(
02 // Missing code
03 );
04 obj.dispatchEvent(event);
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options can be inserted at line 02?
- A. ' update ' , { detail: { recordId: ' 123abc ' } }
- B. ' update ' , ' 123abc '
- C. ' update ' , { recordId: ' 123abc ' }
- D. { type: ' update ' , recordId: ' 123abc ' }
Correct Answer: A,C 🗳️
Explanation: Only visible for Prep4sureExam members. You can sign-up / login (it's free).
A developer has a module that contains multiple functions.
What kind of export should be leveraged so that multiple functions can be used?
- A. multi
- B. default
- C. named
- D. all
Correct Answer: C 🗳️
Explanation: Only visible for Prep4sureExam members. You can sign-up / login (it's free).
Refer to the following code:
< html lang= " en " >
< body >
< button class= " secondary " > Save draft < /button >
< button class= " primary " > Save and close < /button >
< /body >
< script >
function displaySaveMessage(event) {
console.log( ' Save message. ' );
}
function displaySuccessMessage(event) {
console.log( ' Success message. ' );
}
window.onload = function() {
document.querySelector( ' .secondary ' )
.addEventListener( ' click ' , displaySaveMessage, true);
document.querySelector( ' .primary ' )
.addEventListener( ' click ' , displaySuccessMessage, true);
}
< /script >
< /html >
- A. > Outer message
- B. > Outer message
Inner message - C. > Inner message
- D. > Inner message
Outer message
Correct Answer: B 🗳️
Explanation: Only visible for Prep4sureExam members. You can sign-up / login (it's free).
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Viewing questions 1-5 out of 149 questions.
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