ThebookrequiresnopriorknowledgeofJavaScriptandworksfromthegrounduptogiveyouathoroughgroundinginthispowerfullanguage.IfyoudoalreadyknowsomeJavaScript,youwillfindplentyofeye-openersasyoudiscoverjustwhatthelanguagecando.Thisbooktakesado-it-yourselfapproachwhenitcomestowritingcode,becausethebestwaytoreallylearnaprogramminglanguageisbywritingcode.YouareencouragedtotypecodeintoFirebug'sconsole,seehowitworksandthentweakitandplayaroundwithit.Therearepracticequestionsattheendofeachchaptertohelpreviewwhatyouhavelearned.