React to directed tweets

- [Narrator] Now we need to do the plumbing work if you will…to actually made our bot listen to a stream of Tweets…on Twitter.…So we're going to make ourselves a function called Monitor…and the monitor function is going to take a session…fairly straight forward, clearly that's something we created…just here but also here we're saying that this function…takes another function as an argument.…You might have remembered much earlier in the course…we were hovering over functions just looking at their type…signatures like I might have hovered over that and…seen that that took a unit argument and returned a…Choice.result of UserSession and string.…

Though here, we're doing the opposite thing.…We're actually sending a function signature in…and the function signature of our onHit parameter…is it going to be something that takes a UserSession…and a Tweet and returns units, in other words,…returns nothing at all.…Then in the body of monitor, we call GetUserStream,…which once again is a thing which provided by box kite…