Salesforce JavaScript Developer I Practice Exam

The Salesforce Certified JavaScript Developer I Credential is designed for individuals with proficiency, expertise, and practical experience in developing front-end and/or back-end JavaScript applications for web stacks. These skills are versatile across frameworks and are not restricted to mobile or device-specific platforms.

This certification validates the foundational JavaScript skills as well as the hands-on development abilities of candidates required to work with JavaScript-related technologies such as the Lightning Component framework, particularly Lightning Web Components (LWC). Lightning web components are customized HTML elements constructed using standard HTML and contemporary JavaScript.

The certification process comprises two components: the JavaScript Developer I proctored multiple-choice exam and the Lightning Web Components Specialist Superbadge. These components can be completed in any order. The multiple-choice exam assesses knowledge exclusively in JavaScript, while the superbadge evaluates practical Lightning Web Component development skills. By successfully completing both components, individuals automatically qualify for the Salesforce Certified JavaScript Developer I credential.

Who should take the exam?

The candidate aiming for the Salesforce Certified JavaScript Developer I certification utilizes the JavaScript language within one or more frameworks to create front-end and/or back-end applications. They possess the ability to conceptualize, develop, and assess solutions that are both efficient and sustainable, ensuring they are reusable.

Additionally, the candidate is proficient in applying JavaScript-specific design patterns for programming and can integrate JavaScript with CSS, HTML, and other markup languages seamlessly.

With Lightning Web Components (LWC), any JavaScript developer can effortlessly extend their skills to Salesforce. This means that millions of JavaScript developers worldwide can seamlessly transition to coding on the Salesforce platform without the need for additional learning. Leveraging the existing array of developer services within the Lightning Platform and the contemporary JavaScript language, developers can construct and deploy lightning-fast applications on Salesforce.

The Salesforce Certified JavaScript Developer I certification is designed for Salesforce partners, customers, and employees who engage with JavaScript and possess expertise in the Lightning Component framework, along with experience in developing Lightning Web Components (LWC). Common job roles aligned with the Salesforce Certified JavaScript Developer I certification include:

• JavaScript programmer
• Salesforce Developer
• Full stack developer
• Web application developer
• Front-end developer
• Software/backend developer
• Support engineer
• Technical product/project manager
• UI/UX engineer

Exam Details

• Exam Name: Salesforce Certified JavaScript Developer I
• Exam Languages: English
• Exam Questions: 60 Questions
• Time: 105 minutes
• Passing Score: 65%

Course Outline 

The Exam covers the given topics  - 

Domain 1: Understand 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.

Domain 2: Learn about 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.

Domain 3: 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.

Domain 4: Understand Debugging and Error Handling: 7%

• Given a scenario, handle errors properly.
• Given code to be debugged, use the console and breakpoints.

Domain 5: Asynchronous Programming: 13%

• Given a scenario, apply asynchronous programming concepts.
• Given a scenario, use event loop and event monitor or determine loop outcomes.

Domain 6: Learn 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.

Domain 7: 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.