I think this lecture can be very difficult for those who are new to JavaScript. However, if you want to learn JavaScript from the beginning in a deep and thorough way, I highly recommend it. At first, I thought I had studied the basics of JavaScript quite a bit, so I was very hesitant about whether to buy the beginner's lecture. But if I had skipped the beginner's lecture, it would have been a big mistake... There was more unknown content and confusing parts than I thought. The advantage of this lecture is that the flow of the lecture is very logical, so it is easy to understand the concepts. It starts with defining terms and gradually expands the knowledge, which is truly an art... I knew about constructor functions and prototype concepts, but I didn't understand them well, but it was really amazing to see the flow of them start to take shape in my head😆😆😆😆😆 I expect other lectures to be of high quality, deep, and genuine. I sincerely appreciate the sharing of knowledge with substance. I'll see you in the engine core lecture!

I am a junior developer currently working as a front-end developer. I thought I knew it well, but after watching this lecture, I found myself knowing it here and there. Now, I will write my course review. I am writing this review after listening to all four lectures, from the JavaScript beginner course to the ES6 advanced course. I think the best course review is when you can write about things that you couldn't write because you had vague knowledge. For example, by knowing the argument value that will receive the parameter value as this after the map, forEach, and filter functions, I was able to finish the time complexity of (n2) by repeating the loop twice, and as the concept of call, apply, and bind became clearer, I was always confused about this, but when I was confused, I could directly bind this when calling the function and handle it. And as for the concept of scope, while listening to the in-depth course, I found it step by step, and if it is not there, I look for __proto__, and if it is not there, I look for __proto__ in the lower part, etc. I don't know if this expression is right, but I was really blessed while listening to Youngbo's lecture... And last night, while implementing csr directly in vanilla, I felt the fun of learning about things that I would not have even known the principles of in the front-end framework, such as inheriting built-in objects for class events and processing them. Certainly, even people in the team said that my code has suddenly become surprisingly clean. They told me stories. For those of you who are thinking about taking the course, this is a course that you will not regret spending money on. Especially for those of you who want to know and use it for sure, you will feel that there are many more convenient, better, and more efficient built-in functions than the ones you used every day. Don't hesitate, I recommend that you purchase all of Youngbo's lecture series and listen to them all. You will feel that the quality of your code will change and your way of thinking will change. I am proud of it.

Thanks to the detailed and accurate explanation from A to Z, studying JavaScript was fun for the first time!! I was really grateful the whole time I was listening to all the tips that came from experience ㅠㅠ It's the best lecture I've ever taken. If I were to summarize my feelings in one sentence, I would say that classics are eternal. Teacher, I hope you are always healthy and happy^^ Thank you for the great lecture.

I read the ES6 book so smoothly and it helped me understand parts that I didn't understand even after looking them up more than 10 times elsewhere, so I became a real fan. As a beginner working with JavaScript, I came across Youngbo's book and searched for it and even took the lecture! Thank you so much for making JavaScript feel more familiar. It's my job to utilize it, but I feel like I've grown a step because I'm reading code with meaning rather than just reading code.

I am a complete beginner who just wanted to code my own website with a designer base. I only had prior knowledge of HTML/CSS and studied JavaScript briefly at Codecademy, but I couldn't remember it well (I didn't think I understood the concepts clearly), so I decided to take a basic lecture and purchased the course. If you look at the lecture itself, you might think that the lecture time is very short, but in that short time, important concepts are explained so clearly that you won't need to ask questions. It is explained so cleanly that you really won't need to ask questions. I personally think that even beginners who don't know anything about JavaScript will get a lot of help if they start. (When I looked at books for beginners in JavaScript such as e-books, I felt like the concepts were really firmly established in my head with the short lectures, even though I didn't understand them at all. Also, when reviewing after coding, I looked at the O'Relly JavaScript Rhinoceros book again, and when I read while comparing the parts explained by the teacher with the keynote, I felt like the concepts were firmly established, so it was very helpful.) In my case, when I was reviewing on my own, I used post-its and such to cover up the coded parts as the teacher said, and I tried coding on my own, and at the same time, I practiced JavaScript separately at Codecademy and continued coding on my own. I think it's because the basics were so well laid out that there were no parts that I didn't understand and stopped in the middle. (I thought, "Isn't it difficult?" but the explanation was so easy to understand that I thought, "Why is this difficult?" several times. Haha) And I was also turned upside down by gag points such as ramen here and there. (It may be just my taste, but I thought it would be boring at first, but guess what... there were so many parts that made me laugh out loud because of the comments he made here and there.) What's really amazing is that when Professor Kim Young-bo explains a concept, I think about which situation and which code I can use it with, and when implementing something like this, I think about whether I can use this code, and when I look at other people's code, I feel like I've gained the ability to understand the code itself, like I'm using it in this situation (I guess it's not just repetitive learning, but implementing the code while thinking about it). I'm very satisfied because the professor shared many valuable experiences and even small details that he realized in the practical part. However, in order to properly utilize this lecture, as the professor said in the first lecture, I need to practice and review my personal coding experience properly so that it can be utilized as knowledge that remains in my head. (i.e. listening to the lecture - covering the coding part in the keynote with a piece of paper and proceeding on your own - if you get it wrong, think about what you did wrong rather than looking at the answer - if you don't understand the concept, listen to the lecture again (or compare it to other JavaScript books and review the concept again and organize it) - repeat coding... Simply watching the lecture is not something that will stay in your head no matter how good the lecture is.) I can't believe that such a high-quality lecture can be kept for 5 years and costs 30,000 won. Thank you so much for sharing your valuable knowledge, teacher.

It feels like a JavaScript textbook. It's like a lecture that doesn't require questions. Doesn't the fact that there are no questions mean that everything is explained well?

I'm a beginner, but it was a lot harder than I thought. The terminology, such as object instance, object prototype, method, function, and class, was difficult, and it wasn't easy to organize it in my head. It was like the police department was like a soy sauce factory manager with bars and iron bars. I understood how the code worked and how to do formulas, but the operating principles and fundamentals were very difficult. I finished reading it once, so I will listen to it repeatedly for the difficult parts. The lecture was good because it explained things in detail and answered questions quickly. I will master this lecture and see you in the next advanced course.

Thank you very much. It's a really good lecture. I recommend it to anyone who wants to learn JavaScript.