Mastery in JavaScript: From Beginner to Expert
Udemy
Issued by
Udemy
Date
January 2025
Duration
12.5 horas
Technologies covered
What I learned
JavaScript in depth, from fundamentals to advanced concepts: closures and lexical scope, prototypes and prototypal inheritance, the binding of "this" depending on the call context, and how the Event Loop really works (call stack, microtasks vs macrotasks) to understand why asynchronous code executes in the order it does. Also handling promises and async/await, DOM manipulation without frameworks, consuming APIs with Fetch, and the modern ES6+ features (destructuring, spread/rest, modules, arrow functions) that I use today without thinking but that I didn't fully understand at the time.
How I applied it
It is the direct reinforcement of the JavaScript I use every day in Node.js (backend) and React/Next.js (frontend). Understanding the Event Loop and microtasks well has helped me debug concurrency bugs and race conditions in async calls that I previously solved by "trial and error." ES6+ features (destructuring, modules, arrow functions) I use in every file I write, and understanding prototypes/inheritance helps read third-party library code without it feeling like magic.