It seems the author's notion of Reactive programming is listening for event. While event handling is useful, it has been in Javascript for the longest time and

It seems the author's notion of Reactive programming is listening for event. While event handling is useful, it has been in Javascript for the longest time and it's nothing new. Event based updates can have very poor performance, MxN problem. Also Reactive programming is more of having a declarative way to structure data flow so that changes can happen automatically, like a spreadsheet.