Maybe I don't get it, but what is the practical use-case for this? Infinite arrays of numbers - maybe useful for math or statistical applications, but are peopl

Maybe I don't get it, but what is the practical use-case for this? Infinite arrays of numbers - maybe useful for math or statistical applications, but are people using javascript for this over things like MATLAB, R, etc? I can't think of anywhere to use this in the context of building applications and I certainly don't feel like it "completely changed the way I think about programming" at all. Edit: So it looks like you can put more than just numbers into the streams -- still what does this do that Underscore.js doesn't?