The question in the title of this presentation refers to the ultimate book, or rather a series of books, on JavaScript with the common title YDKJS. To know JavaScript you must, in the words of Peter Norvig, program in it for 10 years. Let me adapt that. First you program in JavaScript for 5 years, during which you read various books including [Cro08]. Then you program for 5 more years during which you read [Sim15x]. Then you know JavaScript!
It is a bit like in [DNA79]. After 7.5 million years you know the answer. 42! If you want to know the question you must wait another 7.5 million years.
var NML = { name: "Niels Müller Larsen", emailaddress: "nml@acm.org", web: "x15.dk", educationally: { qualifications: [ {qual: "MSc, Networked Information Engineering"}, {qual: "Specialized Computer Studies, Automating Authentication"}, {qual: "Programmer"} ] }, occupationally: "Professor", chairs: { orgs: [ {org: "FUMLE"} ] } }