Yes.
> How much money would I need to stay in New York for 3 months?
About $1000/month for rent, give or take, and $112 for a metrocard. Plus whatever you spend on food (depends how much you cook) and entertainment.
I did then blow the money I'd saved by eating out every day, but that's a different matter.
I don't know why but I always assumed it was yet another "we teach non programmers some javascript"-programme. But it's really the opposite.