Um, 'new data structure'? You have to be kidding. This is implemented in practically every single functional programming language. Also, this was already done i

Um, 'new data structure'? You have to be kidding. This is implemented in practically every single functional programming language. Also, this was already done in JavaScript: https://github.com/Gozala/streamer https://github.com/Gozala/streamer and looks surprisingly similar to your library. As you can see, streams in JavaScript are nothing new.