JavaScript DOM lessons

Closures, Scope & Memory: What Really Happens Under the Hood Why closures are powerful, dangerous, and often misunderstood Closures are one of JavaScript’s greatest superpowers — and one of its most common sources of bugs, memory leaks, and confusion. Most developers use closures.Far fewer truly understand what they capture, how long they live, and why … Read more

Project: JavaScript Flashcard Study App (JSON + Progress + Save Progress) https://github.com/lsvekis/JavaScript-Projects A flashcard app that: 1) cards.json { “title”: “JavaScript Flashcards”, “cards”: [ { “id”: 1, “front”: “What is the DOM?”, “back”: “Document Object Model” }, { “id”: 2, “front”: “What does querySelector() return?”, “back”: “The first element that matches a CSS selector” }, … Read more

https://github.com/lsvekis/JavaScript-Projects How to Create a Quiz with JavaScript (HTML + CSS + JSON) This tutorial shows you how to build a simple quiz app using modern JavaScript. The quiz loads questions from a JSON file, lets users pick answers, tracks progress, and displays a final score. What you will build Loads questions from questions.json Displays … Read more

🟦 JavaScript Deep Dive — Issue #14 Designing JavaScript APIs That Are Hard to Misuse How senior engineers design interfaces that prevent bugs instead of documenting them Most bugs don’t come from bad logic.They come from APIs that are easy to use incorrectly. Senior engineers don’t just write code that works —they design APIs that … Read more

🟦 JavaScript Deep Dive — Issue #13 Refactoring JavaScript Safely (Without Breaking Everything) How senior engineers improve code with confidence instead of fear Refactoring is where good intentions go to die. Most developers know their code could be better…but they’re afraid to touch it because: Senior engineers refactor anyway — but they do it safely. … Read more

🟦 JavaScript Deep Dive — Issue #12 Reading JavaScript Code You Didn’t Write (And Understanding It Fast) How senior engineers ramp up quickly in unfamiliar codebases Writing JavaScript is one skill.Reading and understanding existing JavaScript — especially someone else’s — is a completely different one. Most developers struggle not because the code is “bad”…but because … Read more

🟦 JavaScript Deep Dive — Issue #12 Reading JavaScript Code You Didn’t Write (And Understanding It Fast) How senior engineers ramp up quickly in unfamiliar codebases Writing JavaScript is one skill.Reading and understanding existing JavaScript — especially someone else’s — is a completely different one. Most developers struggle not because the code is “bad”…but because … Read more

🟦 JavaScript Deep Dive — Issue #11 (Season 2 Kickoff) Debugging JavaScript Like a Senior Engineer How experts actually find bugs — and why juniors get stuck Most JavaScript bugs aren’t hard because the code is complex.They’re hard because we debug the wrong way. Senior engineers don’t “try random fixes.”They follow systems, mental models, and … Read more