Salesforce Certified JavaScript Developer I Practice Exams

Practice Tests updated based on SPRING '21 Release

These exams are designed to give you an idea of what to expect in the actual certification test.

• Content: 60 multiple-choice/multiple-select questions

• Time allotted to complete the exam: 105 minutes

• Passing score: 65%

Salesforce Certified Javascript Developer Preparation Kit is prepared to help with becoming a certified JavaScript developer. The JavaScript Developer I Multiple-Choice exam is an industry-standard credential in the JavaScript ecosystem. This credential is intended for individuals who have 1-2 years knowledge, skills, and experience developing front-end and/or back-end JavaScript applications for the web stack. This exam validates core JavaScript development skills of candidates who need to work with JavaScript related technologies.

A huge benefit of the Lightning Web Components programming model is that developers write standard JavaScript code. Candidates who pass the JavaScript Developer I exam demonstrate that they have the standard JavaScript fundamentals to develop Lightning web components.

Recommended Training and References

The Salesforce JavaScript Developer I generally has 1-2 years experience as a JavaScript developer and has experience with the following JavaScript topics:

• Data Types & Operators

• Scope

• Type conversion (implicit vs. explicit)

• Strings

• Functions (plus higher order functions)

• Data Structures: Objects & Arrays

• Document Object Model

• Classes

• Modules

• Events

• Error Handling

• Debugging

• Testing (Platform agnostic)

• Asynchronous Programming

• Server-side JavaScript

As preparation for this exam, we recommend a combination of hands-on experience, training course completion, Trailhead trails, and self-study in the areas listed in the Exam Outline section of this exam guide.

The self-study materials recommended for this exam include:

Learning on Trailhead:

• Trailmix: Prepare for your Salesforce JavaScript Developer I Credential

• Trail: Study for the Salesforce JavaScript Developer I Exam

Additional Resources

• JavaScript Guide

  • Objects

  • Functions

  • Control flow and error handling

  • Loops and iteration

  • Promises

• JavaScript Reference

  • Global Objects

  • Expressions and operators

  • Statements and declarations

  • Classes

  • Functions

• JavaScript - Dynamic client-side scripting

• JavaScript Language

  • Fundamentals

  • Error handling

• CLI commands

• Web APIs

• Node.js API

To review online Documentation, Tip Sheets, and User Guides, search for the topics listed in the Exam Outline section of this guide and study the information related to those topics. Documentation, Tip Sheets, and User Guides can also be accessed through Salesforce Help.

Exam Outline

The Salesforce JavaScript Developer I Multiple-Choice exam measures a candidate’s knowledge and skills related to the following sections and objectives.

Variables, Types, and Collections: 23%

• Given a scenario, write code to create variables and initialize them correctly.

• Given a business requirement, utilize strings, numbers, and dates effectively.

• Given a scenario or example, demonstrate awareness of type coercion and its effects.

• Given a specific scenario, distinguish truthy or falsey evaluations

• Given a list of data, demonstrate data manipulation with arrays.

• Given a JSON response, demonstrate how to operate the JSON object.

Objects, Functions, and Classes: 25%

• Given a business requirement, locate the best function implementation.

• Given a business requirement, apply fundamentals of object implementation to solve the business requirement.

• Given a business requirement, apply fundamentals of class implementation to solve the business requirement.

• Given a JavaScript module, give examples of how to use the module.

• Given a JavaScript decorator, give examples of how to use the decorator.

• Given a block of code, analyze the variable scope and the execution flow.

Browser and Events: 17%

• Given a business requirement, utilize Events, event handlers and propagation.

• Given a business requirement, evaluate and manipulate the DOM.

• Given a scenario, utilize the Browser Dev Tools to investigate code behavior.

• Given a scenario and requirements, utilize browser specific APIs.

Debugging and Error Handling: 7%

• Given a scenario, handle errors properly.

• Given code to be debugged, use the console and breakpoints.

Asynchronous Programming: 13%

• Given a scenario, apply asynchronous programming concepts.

• Given a scenario, use event loop and event monitor or determine loop outcomes.

Server Side JavaScript: 8%

• Given a scenario and requirements, infer which Node.js implementation is a good solution.

• Given a scenario and requirements, infer which Node.js CLI command is a good solution.

• Know the core Node.js modules and given requirements, infer which Node.js library/framework is a good solution.

• Given a scenario and requirements, distinguish which Node.Js Package Management solution is the most fitting.

Testing: 7%

• With a block of code and the associated Unit Test, determine where the test is ineffective and modify it to make it more effective.

Please use these exams to supplement your Salesforce Certification Study! Always check out relevant trail on Trailhead to increase your chances to ace the certification test.