JavaScript Developer
4-Step Path to Passing
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Core Resources
Exam Overview
From the official exam guide
Questions
65
Duration
105 min
To Pass
65%
Pricing
$200 registration · $100 retake
Delivery
Online proctored or at a testing center
Experience
1-2 years of JavaScript development recommended
Prerequisites
No prerequisites required
Exam Topics
Each topic section shows the topic weight, learning objectives, and links to study resources.
Variables, Types, and Collections23%
var, let, and const scoping and hoisting, temporal dead zone, type coercion, truthy and falsy evaluation, template literals, destructuring, spread and rest operators, array methods, and JSON parsing.
- 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.
Resources
Objects, Functions, and Classes25%
Function declarations vs. expressions, arrow functions, this binding, call/apply/bind, prototype chains, object creation patterns, ES6 class syntax, private fields, inheritance, ES6 modules, and decorators.
- 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.
Resources
Browser and Events17%
DOM traversal and manipulation, event listeners, bubbling and capturing propagation, stopPropagation vs. preventDefault, browser-specific APIs including fetch, localStorage, sessionStorage, and the History API.
- 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.
Resources
Debugging and Error Handling7%
try/catch/finally, custom Error subclasses, structured error propagation, console API methods, Chrome DevTools breakpoints, and debugging async code.
- Given a scenario, handle errors properly.
- Given code to be debugged, use the console and breakpoints.
Resources
Asynchronous Programming13%
Call stack, task queue, microtask queue, the event loop model, Promises, Promise.all/allSettled/race, async/await, error propagation in async code, and tracing execution order across async boundaries.
- Given a scenario, apply asynchronous programming concepts.
- Given a scenario, use event loop and event monitor or determine loop outcomes.
Resources
Server Side JavaScript8%
Node.js core modules, npm and npx package management, package.json semantics, the require vs. ES module distinction, Express framework basics, and when to use Node.js for server-side solutions.
- 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.
Resources
Testing7%
Jest test structure with describe/it/expect, jest.fn() and jest.spyOn() mocking, toBe vs. toEqual matchers, unit vs. integration test distinctions, and identifying brittle or ineffective tests.
- With a block of code and the associated Unit Test, determine where the test is ineffective and modify it to make it more effective.
Resources
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