Topics of Salesforce JavaScript Developer I Exam
Aspirants must know the exam topics before they start of preparation. Because it will help them to prepare for the below concepts Salesforce JavaScript-Developer-I exam will include the following topics:
1. Variable, Types, and Collection: 23%
Scenario based coding Variables Creation and Initialization JSON object understanding
2. Object, Functions, and Classes: 25%
Implementation of different functions Understanding of different modules of Javascript Scope of variables and their execution flow
3. Browser and Events: 17%
Handling and propagation of events Development tools of browsers Understanding of browser specific APIs
4. Asynchronous Programming: 13%
Asynchrounous programming different concepts Monitoring and management of different loops
5. Server Side Javascript: 8%
Implementation of Node.js Understanding of Node.js CLI commands
6. Testing: 7%
Unit Testing effectiveness of different tests
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How to book the Salesforce JavaScript-Developer-I Exam
There are the following steps for registering the Salesforce JavaScript Developer I exam. Step 1: Visit Salesforce Exam Registration Step 2: Signup/Login to Salesforce account Step 4: Select Date, time and confirm with the payment method
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 |
|---|---|---|
| Server-Side JavaScript | 8% | - Command-line tools and scripts - Node.js fundamentals and runtime - Core Node.js modules - Module system and require/import |
| Objects, Functions, and Classes | 25% | - Decorators and advanced function patterns - Object creation, properties, and methods - Closures and execution context - Modules and imports/exports - Function definitions, parameters, and scope - Class syntax, inheritance, and prototypes |
| Testing | 7% | - Code coverage and best practices - Unit testing concepts - Test doubles and mocks - Testing frameworks and assertions |
| Debugging and Error Handling | 7% | - Defensive programming practices - Debugging tools and breakpoints - Error types and exception handling - Console methods and logging |
| Asynchronous Programming | 13% | - Async/await syntax - Event loop and micro/macro tasks - Fetch API and HTTP requests - Promises and chaining - Callbacks and callback hell |
| Browsers and Events | 17% | - Script loading and execution order - Window and document object properties - Document Object Model (DOM) manipulation - Browser APIs and Web Storage - Event handling, propagation, and delegation |
| Variables, Types, and Collections | 23% | - JSON parsing and usage - Type coercion and conversion rules - Working with strings, numbers, dates, and booleans - Array methods and data manipulation - Truthy and falsy values - Variable declaration and initialization |
Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions:
01 function changeValue(obj) {
02 obj.value = obj.value / 2;
03 }
04 const objA = { value: 10 };
05 const objB = objA;
06
07 changeValue(objB);
08 const result = objA.value;
What is the value of result?
- A. 10
- B. 5
- C. NaN
- D. undefined
Correct Answer: B 🗳️
Explanation: Only visible for Actual4Exams members. You can sign-up / login (it's free).
Given the code below:
01 function Person() {
02 this.firstName = ' John ' ;
03 }
04
05 Person.proto = {
06 job: x = > ' Developer '
07 });
08
09 const myFather = new Person();
10 const result = myFather.firstName + ' ' + myFather.job();
What is the value of result when line 10 executes?
- A. undefined Developer
- B. Error: myFather.job is not a function
- C. John undefined
- D. John Developer
Correct Answer: B 🗳️
Explanation: Only visible for Actual4Exams members. You can sign-up / login (it's free).
Refer to the code:
const pi = 3.1415926;
What is the data type of pi?
- A. Number
- B. Decimal
- C. Float
- D. Double
Correct Answer: A 🗳️
Explanation: Only visible for Actual4Exams members. You can sign-up / login (it's free).
A developer is leading the creation of a new web server for their team that will fulfill API requests from an existing client. The team wants a web server that runs on Node.js, and they want to use the new web framework Minimalist.js. The lead developer wants to advocate for a more seasoned back-end framework that already has a community around it.
Which two frameworks could the lead developer advocate for?
- A. Gatsby
- B. Angular
- C. Next
- D. Next.js
Correct Answer: C,D 🗳️
Explanation: Only visible for Actual4Exams members. You can sign-up / login (it's free).
Refer to the following code:
01 let obj = {
02 foo: 1,
03 bar: 2
04 }
05 let output = []
06
07 for (let something of obj) {
08 output.push(something);
09 }
10
11 console.log(output);
What is the value of output on line 11?
- A. [ " foo " , " bar " ]
- B. [1, 2]
- C. [ " foo:1 " , " bar:2 " ]
- D. An error will occur due to the incorrect usage of the for_of statement on line 07.
Correct Answer: D 🗳️
Explanation: Only visible for Actual4Exams members. You can sign-up / login (it's free).
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This means that if due to any reason you are not able to pass the JavaScript-Developer-I actual exam even after using our product, we will reimburse the full amount you spent on our products. you just need to mail us your score report along with your account information to address listed below within 7 days after your unqualified certificate came out.
