This book is aimed at intermediate JavaScripters. You should know how variables are scoped. Keywords like typeof, arguments, and this shouldn’t faze you. Perhaps most importantly, you should understand that
| func(function(arg) { return next(arg); }); |
is just a needlessly verbose way of writing
| func(next); |
except in rare cases. (See Reg Braithwaite’s excellent article “Captain Obvious on JavaScript” for more examples of small but important functional idioms.)[5]
What you don’t need to know is how asynchronous events are scheduled in JavaScript. We’ll cover that in the next chapter.
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