I'm sure this is going to read as dickish, but I personally would be much more inclined to give a thoughtful response if your question showed some evidence of you having attempted to explore this question before asking other people to spoon feed you answers.
This is really one of those questions that _requires_ someone to spoon feed you the answer.
He is asking a Scala expert to describe how a port to JavaScript allows developers to take advantage of advanced Scala language features or tools. The alternative is spending hours working with Scala and coming up with the answer himself.
Being a discussion forum, I don't see why you have a problem giving away knowledge freely over HN.
I've got no problem at all answering people's questions, if you look at my comment history. I just think this particular question was both vague and lazily written. It's natural that a question requires more effort to answer than to ask, but a thoughtfully asked question clues potential answerers into what the asker already knows and has already attempted to do to educate themselves. Like "I know Scala is X and Y, but why would these things be useful on the browser side?" or if you don't know anything about Scala in the first place, "I read Wikipedia about Scala but didn't understand Z, could someone explain this?"
