## function _identity(val) { return val } This lecture really showed me a lot. I'm still watching it, but I'm sure there are a lot of lectures left, so I'm leaving a review. 1. As I learned about functional programming, I was able to understand the way I used to do things better. When I compared it with object-oriented programming (I don't know how faithful I am to this method), it really stuck in my head. From the differences in the way of thinking of the two methodologies to the point of view... everything was really amazing. 2. The background explanation of the basic way of thinking of functional programming, why it's necessary, and what advantages it has was so good. Maybe it was because I had that in mind, but studying was fun. And when you showed me this concretely by making a function like assembling Legos, I became even more confident in FP (Functional Programming). 3. _identity was a function that really made me realize a lot. This function gave me a sense of direction as I learned JavaScript. In the past, I used to study grammar vaguely and do examples, but I got bored and only had questions about why I had to do it. However, after seeing the above functions and seeing how you use them, I realized that each grammar contains numerous possibilities. I learned that when approaching, I should not simply focus on the command results, but also pay attention to the role or concept. Thank you so much for giving me this insight!