I love tools like this. I was using a mongoDB one the other day which was pretty nice, too.
No better way to learn than by example, and you can take a lot more from it than reading a 20-odd page tutorial.
This may be a matter of opinion, but I think the order in which new concepts are introduced could be tweaked. You're first introduced to string literals. Then variables are introduced. Then it's back to string literals. Then some variables. Then a tiny bit on numbers which suddenly shifts back to string literals in the same lesson.
It seems that introducing the concept of variables is a little premature in those first four lessons considering they're rarely, if at all, manipulated, and aren't applied consistently enough to really understand what they're for.
No better way to learn than by example, and you can take a lot more from it than reading a 20-odd page tutorial.
This may be a matter of opinion, but I think the order in which new concepts are introduced could be tweaked. You're first introduced to string literals. Then variables are introduced. Then it's back to string literals. Then some variables. Then a tiny bit on numbers which suddenly shifts back to string literals in the same lesson.
It seems that introducing the concept of variables is a little premature in those first four lessons considering they're rarely, if at all, manipulated, and aren't applied consistently enough to really understand what they're for.