Ethereum Tutorial: Ethereum & Smart Contracts from Scratch (Udemy.com)

This session, your code was not work to me. So I'm modified below code, const STOP = 'STOP'; const ADD = 'ADD'; const PUSH = 'PUSH'; class Interpreter { constructor() { this.state = { programCounter: 0, stack: [], code: [], }; } runCode(code) { this.state.code = code; while (this.state.programCounter < this.state.code.length) { const opCode = this.state.code[this.state.programCounter]; switch (opCode) { case STOP: return this.state.stack[this.state.stack.length - 1]; // Gracefully stop execution case PUSH: this.state.programCounter++; const value = this.state.code[this.state.programCounter]; this.state.stack.push(value); break; case ADD: const a = this.state.stack.pop(); const b = this.state.stack.pop(); this.state.stack.push(a + b); break; default: throw new Error(`Unknown opcode: ${opCode}`); } this.state.programCounter++; } return null; // Return null if no STOP opcode is encountered } } const code = [PUSH, 2, PUSH, 3, ADD, STOP]; const interpreter = new Interpreter(); const result = interpreter.runCode(code); console.log(result); // Output: 5

Very polished course, what a teacher at the top of his teaching game, the way he dictates the code allows me to type as a just listen to his word, it makes for a smooth experience. A lot of work and effort must have been put into preparing course. I put amazing because even though it's complex project I had still had fun, and all the credit for this goes to the teacher.

Clear instructions. good pace as there is lots to get through, but as the explanations are so good, progress is quick

This course is exactly what I was looking for. What the most interesting about it that all the code is organized in clean and neat way, and the progress is very logical which makes it easy to understand.

David does a good job of narrating his coding by using proper terms for coding. It's almost a sub-course in how to "read" code. This course goes fast and is very deep. I'm astonished at how much it covers. It appears that the entire Ethereum beige paper is covered. That's just an incredible amount of computer science coming at you at lightning speed. This is a tour-de-force of javascript. I find myself saying, "So that's how X works in Y framework..." In short, even if you are not interested in blockchain, I would recommend this course as a deep dive into some really interesting parts of programming.

Great instructor with great courses that is my third course from David, and I still learning new things. This course is very advanced, so I would recommend if you don't know javascript to start with his course "Essentials in JavaScript ES6 - A Fun and Clear Introduction". Then an excellent intro to the blockchain is "Build a Blockchain & Cryptocurrency | Full-Stack Edition" and finally this as a final course. However, if you already know blockchain and node, this is the course for you, definitely the best on Udemy

This is my fourth course with David and they're all excellent and joy to follow. This course is a beginner-level on how to develop a blockchain topped with crypto and smart contracts, and it served the purpose of getting me interested in pursuing the research on smart contracts to learn and develop real-world implementation. Basically, the smart contract part of the course is oversimplified. I mean I could not think of any real use to it. The one good thing about it, it got me thinking to plan a more advanced version, something that works for a purpose within the context of blockchain and cryptocurrency. In all however, I'm not disappointed, it's still a 5 star introductory course with lots of educational material.

David, just wanted to thank you for the course. For me there's no way better to understand the mechanics of blockchain, ethereum, smart contracts etc. than to actually code them from scratch, and at the moment your course is one of the best, if not the only one, that is available in the market. I followed along in my own environment, and enjoyed every single milestone achieved along the way. Thanks again!!

About 25% through the course. At first I was a bit perplexed why does the author start with writing an interpreter (designs a primitive language). I am being conservative with the rating of 3.5 now, but I like where it's going, fast pace, explains exactly what he's doing and why. Doesn't waste any time 50% through this excellent course. Still explains very well the code written, he's an excellent speaker, obviously knows the subject matter intimately, has a lot of ground to cover, moves at very fast pace.

Before taking this course I also took another course from the same instructor,"Building blockchain and cryptocurrency", and I can say that this one is much in-depth and exciting than the prior. Moreover, this is by far the most comprehensive course on blockchain that I have ever taken. The instructor did a commendable job in explaining each topic clearly and answering all my questions and doubts in QnA section. Ethereum source code is actually very complex and a lot of mathematics is involved in the architecture of Ethereum virtual machine, this course abstracts all the complexity and simplifies it for complete begineers. I would recommend this course to anyone who wants to study ethereum architecture and it's source code.