Free Coupon Code JavaScript Certification Practice Tests: ES6+ & Core Concept 100% OFF

Udemy Free coupon code for JavaScript Certification Practice Tests: ES6+ & Core Concept course taught by Olatinwo Goodness, which has 1,269 students and is rated 5.0 out of 36 votes. This course is about in English and was updated on January 21, 2026. You can use this Udemy course with a free certificate and find the coupon at the bottom of this page.

Master 100+ES6/ES7/ES2023 Interview Questions on Asynchronous JS, Closures, Promises, Scope, Hoisting and the Event

Ready to stop reviewing basic syntax and start dominating technical interviews? This comprehensive practice test course is meticulously designed for JavaScript developers targeting senior-level roles, professional certification and advanced front-end or back-end development proficiency. It moves far beyond beginner tutorials, focusing exclusively on the complex, nuanced mechanics of the language that trip up even experienced engineers.

With 100 highly-rated, expertly crafted questions, you will rigorously test your knowledge across the entire modern JavaScript ecosystem:

1. Asynchronous Mastery & The Event Loop

Achieve fluency in handling time and complexity with advanced asynchronous JavaScript. This section includes deep dives into the execution model, Event Loop architecture, subtle differences between Promises and traditional callbacks and effective error handling with Async/Await.

2. Execution Context & Scoping

Pinpoint your weaknesses in environment control and memory management. We provide thorough testing on Hoisting, the Temporal Dead Zone (TDZ), the critical distinction between var, let, and const, and the power of Closures. Crucially, you will master the four rules of this behavior: implicit, explicit (using call/apply), new binding, and lexical binding.

3. Advanced Core Fundamentals

Validate your understanding of foundational language features. Challenge yourself with advanced questions on Type Coercion (and why strict equality is paramount), intricate Data Structures (Map/Set), the Prototype chain, ES6 Classes and modern Modules (ESM).

Use these realistic, scenario-based tests to diagnose your weaknesses, validate your knowledge, and confidently showcase a deep, architectural understanding of JavaScript in any interview setting. Enroll now and solidify the core foundation required for modern, high-performance development.