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Last Updated: Aug 23, 2026
No. of Questions: 149 Questions & Answers with Testing Engine
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Conversion type (inclusive versus explicit)
Classes
Modules
Item Model Document
Discharge
Asynchronous Programming
Scope of Variables
Activities
Strings
Forms of data and operators
Monitor (agnostic platform)
Control of Mistake
JavaScript on the backend
Functions (more functions in higher order)
Objects & Arrays: Data Structures
To prepare for this test, we advise a combination of practical experience, completion of training courses, pathways and self-study in the areas listed in the examination outline section of this examination guide.
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With the introduction of the Lightning Experience by Salesforce, it is possible to develop cool, looking applications for a wide range of tasks. Admins have been able to create beautiful pages for their objects more than ever, with an interface entirely tailored for each user.For developers, the same application has never before been possible for Salesforce developers to create applications that stretch well beyond Salesforce's declarative features. It's all achieved with the use of a JavaScript application for Lightning & Lightning Web components.
The certification for JavaScript Developer I has just been released and fills a large gap in the certification list for Salesforce. Salesforce Developers who want to prove their Lightning skills, but also new entrants into the Salesforce community, are certified to demonstrate that they know what is relevant. A typical Salesforce 60 multi-choice test is split into two parts and is influenced by a super badge (Similar to Developer II certification).
Preparation Guide for Salesforce JavaScript Developer I Exam
Introduction
Salesforce is a solution for managing customer relationships that unite customers and companies. This is an interactive CRM platform that provides a single, shared view of every client in all the divisions including marketing, distribution, exchange, and operation. Provide the clients with the individual experience Salesforce demand 360 product via the Integrated CRM Platform. It delivers solid and related goods to boost marketing, revenue, exchange, operation, IT, and more. Salesforce is a digital cloud computing (SaaS) firm specializing in the management of client relationships (CRMs). There was a mistake. The app is now the number one of consumer satisfaction and allows organizations to track customer behavior, advertise to consumers, and more. Salesforce is common because it is bundled with features such as contact management, workflow development, task management, incentive monitoring, teamwork tools, customer experience tools, analytics, and interactive, smartphone dashboard.
Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
| Section | Weight | Objectives |
|---|---|---|
| Objects, Functions, and Classes | 25% | - Closures and execution context - Function definitions, parameters, and scope - Decorators and advanced function patterns - Class syntax, inheritance, and prototypes - Object creation, properties, and methods - Modules and imports/exports |
| Debugging and Error Handling | 7% | - Error types and exception handling - Defensive programming practices - Debugging tools and breakpoints - Console methods and logging |
| Variables, Types, and Collections | 23% | - JSON parsing and usage - Array methods and data manipulation - Variable declaration and initialization - Type coercion and conversion rules - Truthy and falsy values - Working with strings, numbers, dates, and booleans |
| Server-Side JavaScript | 8% | - Module system and require/import - Command-line tools and scripts - Core Node.js modules - Node.js fundamentals and runtime |
| Testing | 7% | - Unit testing concepts - Code coverage and best practices - Test doubles and mocks - Testing frameworks and assertions |
| Asynchronous Programming | 13% | - Callbacks and callback hell - Promises and chaining - Event loop and micro/macro tasks - Async/await syntax - Fetch API and HTTP requests |
| Browsers and Events | 17% | - Browser APIs and Web Storage - Event handling, propagation, and delegation - Script loading and execution order - Window and document object properties - Document Object Model (DOM) manipulation |
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