Intermediate. It would work well as the second book you read on JavaScript (or, given the way most devs come to JavaScript, the book you read after reading a bo

Intermediate. It would work well as the second book you read on JavaScript (or, given the way most devs come to JavaScript, the book you read after reading a book on jQuery). But there's stuff in there that even experienced devs might not know about, like Promises and control flow libs like Async.js.