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
Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
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Introduction to Salesforce JavaScript Developer I Exam
The credential Salesforce Accredited JavaScript Developer I is meant for applicants who build JavaScript applications for the web stack on the front-end and/or back-end.This validates both key JavaScript expertise and functional skills for applicants, for example, Lightning Components Platform, and Lightning Web Component technology relevant to JavaScript. Lightning web elements are personalised HTML elements that are designed with traditional HTML and modern JavaScript.
The Salesforce JavaScript Developer I certification requires two parts: the multiple-choice test given by the JavaScript Developer I and the Superbadge Lightning Web Components. In any order, all these credentials can be accessed. A Salesforce Certified Javascript Developer I certification is immediately obtained by adding these two certificates. The qualification applicant for Salesforce JavaScript Accredited Developer I will use the JavaScript language to build front-end or back-end software in one or more frameworks. The applicant will plan, build and evaluate effective , safe and reusable solutions.
The candidate can use JavaScript-specific programming style patterns and can use CSS , HTML, and other languages for integrating JavaScript. With Lightning Web Components, any JavaScript developer can build on Salesforce easily. This means that millions of JavaScript developers around the world will code on Salesforce without learning anything new. Developers can create and deploy brand-new fast apps on Salesforce using the current Lightning Platform development services portfolio and the modern JavaScript language. Salesforce JavaScript Developer I Certificate from Salesforce is designed to help Salesforce partners, customers and employees working on JavaScript as well as the Lightning Component Platform, know-how and knowledge and creation of Lightning web components (LWC's).
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Salesforce JavaScript-Developer-I Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Asynchronous Programming | 13% | - Callbacks and callback hell - Async/await syntax - Fetch API and HTTP requests - Event loop and micro/macro tasks - Promises and chaining |
| Variables, Types, and Collections | 23% | - Truthy and falsy values - JSON parsing and usage - Variable declaration and initialization - Type coercion and conversion rules - Array methods and data manipulation - Working with strings, numbers, dates, and booleans |
| Testing | 7% | - Test doubles and mocks - Code coverage and best practices - Unit testing concepts - Testing frameworks and assertions |
| Objects, Functions, and Classes | 25% | - Closures and execution context - Decorators and advanced function patterns - Object creation, properties, and methods - Modules and imports/exports - Function definitions, parameters, and scope - Class syntax, inheritance, and prototypes |
| Debugging and Error Handling | 7% | - Debugging tools and breakpoints - Defensive programming practices - Console methods and logging - Error types and exception handling |
| Browsers and Events | 17% | - Event handling, propagation, and delegation - Script loading and execution order - Browser APIs and Web Storage - Window and document object properties - Document Object Model (DOM) manipulation |
| Server-Side JavaScript | 8% | - Node.js fundamentals and runtime - Module system and require/import - Command-line tools and scripts - Core Node.js modules |
Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions:
A developer wants to use a module named universalContainerslib and then call functions from it. How should a developer import every function from the module and then call the functions foo and bar?
- A. import * from ' /path/universalContainerslib.js ' ;
universalContainerslib.foo();
universalContainerslib.bar(); - B. import {foo, bar} from ' /path/universalContainerslib.js ' ;
foo();
bar(); - C. import all from ' /path/universalContainerslib.js ' ;
universalContainerslib.foo();
universalContainerslib.bar(); - D. import * as lib from ' /path/universalContainerslib.js ' ;
lib.foo();
lib.bar();
Correct Answer: D 🗳️
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Refer to the code below:
01 let timedFunction = () = > {
02 console.log( ' Timer called. ' );
03 };
04
05 let timerId = setInterval(timedFunction, 1000);
Which statement allows a developer to cancel the scheduled timed function?
- A. clearInterval(timerId);
- B. clearInterval(timedFunction);
- C. removeInterval(timerId);
- D. removeInterval(timedFunction);
Correct Answer: A 🗳️
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Which three browser specific APIs are available for developers to persist data between page loads?
- A. IIFEs
- B. global variables
- C. indexedDB
- D. cookies
- E. localStorage
Correct Answer: C,D,E 🗳️
Explanation: Only visible for DumpsReview members. You can sign-up / login (it's free).
Refer to the code snippet:
01 function getAvailableilityMessage(item) {
02 if (getAvailableility(item)) {
03 var msg = " Username available " ;
04 }
05 return msg;
06 }
What is the return value of msg when getAvailableilityMessage( " newUserName " ) is executed and getAvailableility( " newUserName " ) returns false?
- A. undefined
- B. " msg is not defined "
- C. " newUserName "
- D. " Username available "
Correct Answer: A 🗳️
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A developer is asked to fix some bugs reported by users. To do that, the developer adds a breakpoint for debugging.
01 function Car(maxSpeed, color) {
02 this.maxSpeed = maxSpeed;
03 this.color = color;
04 }
05 let carSpeed = document.getElementById( ' carSpeed ' );
06 debugger;
07 let fourWheels = new Car(carSpeed.value, ' red ' );
When the code execution stops at the breakpoint on line 06, which two types of information are available in the browser console?
- A. The information stored in the window.localStorage property
- B. A variable displaying the number of instances created for the Car object
- C. The values of the carSpeed and fourWheels variables
- D. The style, event listeners and other attributes applied to the carSpeed DOM element
Correct Answer: A,D 🗳️
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