According to Schmedtmann, a modern JavaScript developer must master several key areas:
JavaScript evolved significantly after 2015. Jonas emphasizes modern syntax (Arrow functions, Destructuring, Template Literals) from the beginning, ensuring you don't learn "outdated" coding habits. 3. DOM Manipulation
| Feature | | Colt Steele | Angela Yu | | :--- | :--- | :--- | :--- | | Teaching Style | Deep, theoretical, visual | Fast-paced, practical | Structured, outcome-based | | Focus | Pure JS Mastery | Full Stack (JS + Backend) | Web Dev broadly (Front + Back) | | Difficulty | High (Deep dives) | Medium | Medium | | Best For | Mastering the Language | Building Apps quickly | Career changers |
Of course, no course is without critique. Some argue that the sheer length of the course (nearly 70 hours) leads to redundancy, particularly in the section on asynchronous JavaScript. Others note that while the course covers ES6 and modern features beautifully, it occasionally glosses over deeper functional programming concepts like monads or advanced composition. However, these are critiques of depth, not quality. For the target audience—from bootcamp graduates seeking to fill gaps in their knowledge to career-changers building their first portfolio—the pacing is a feature, not a bug. javascript by jonas
The course starts with the basics—data types, operators, and logic. Even if you are a total beginner, Jonas uses real-world analogies that make abstract concepts like "boolean logic" feel intuitive. 2. Modern Tooling (ES6+)
Many courses teach how to write a loop. Jonas teaches how the loop works in memory . He places a heavy emphasis on "Modern JavaScript" best practices (ES6+), discouraging older, legacy patterns that are still common in other tutorials.
Jonas is articulate, methodical, and enthusiastic. He rarely assumes the student already knows something; he explains every step thoroughly, which reduces frustration for beginners. According to Schmedtmann, a modern JavaScript developer must
A workout tracking app that integrates the Leaflet map library and browser Geolocation APIs.
But what makes "JavaScript by Jonas" so different from the thousands of other tutorials on YouTube or Udemy? Here is a deep dive into why this specific learning path has become a rite of passage for modern front-end developers. The Philosophy of "Why" Over "How"
Most coding tutorials focus on syntax—telling you where to put the brackets and how to name a variable. Jonas takes a radically different approach. He focuses on the and the Runtime . DOM Manipulation | Feature | | Colt Steele
Furthermore, the course excels through its philosophy of "active frustration." Where other instructors might provide polished, error-free code from the start, Schmedtmann intentionally walks into common traps. He will write buggy code, stare at a silent error in the console, and narrate his debugging process in real-time. This is not inefficiency; it is pedagogical transparency. By watching an expert struggle, hypothesize, use console.log , and finally resolve a scoping or asynchronous issue, students learn the single most important skill a developer possesses: resilience. The course teaches that bugs are not failures but conversation points with the machine, and that a developer’s primary tool is not syntax memory, but logical deduction.
The journey through Jonas’s curriculum is structured like a building. Each section adds a new floor to your foundational knowledge. 1. The Fundamentals
If your goal is to , this is arguably the best resource available online. It provides the mental models required to debug complex code and understand the ecosystem. However, if you are impatient and want to build a full-stack app immediately with less regard for the underlying mechanics, you might find the pace too slow. It is highly recommended as a prerequisite to learning React or Node.js.
: A significant part of his teaching covers the often-confusing behavior of the this keyword across different function types (regular vs. arrow functions).