IMO this sort of thing is primitive after seeing easel.io last week. I suppose I would have liked this when I was first learning, if just for the error message

IMO this sort of thing is primitive after seeing easel.io last week. I suppose I would have liked this when I was first learning, if just for the error messages. But I think, like any programming, part of the learning is running/viewing your program and figuring out why the output isn't what you expected. Maybe each error pointing to w3schools for more information would benefit the user.