Codecademy took something that scared people, learning JavaScript, and turned it into a game. And when it’s not intimidating, it turns out that learning how to code is something that a lot of people want to do. In its first 72 hours after launching this summer, Codecademy signed up 200,000 people for coding lessons. When it launched a New Years resolution class on Jan. 1, Code Year, it signed up 97,000 people in less than 48 hours to receive emails with weekly coding lessons. By the end of the week, more than 170,000 people had signed up for the class, including the Mayor.