We arrive at this point with hopefully a very healthy, solid understanding of how scope works.
We turn our attention to an incredibly important, but persistently elusive, almost mythological, part of the language: closure. If you have followed our discussion of lexical scope thus far, the payoff is that closure is going to be, largely, anticlimactic, almost self-obvious. There’s a man behind the wizard’s curtain, and we’re about to see him. No, his name is not Crockford!
If however you have nagging questions about lexical scope, now would be a good time to go back and review Chapter 2 before proceeding.