What it does
You Don't Know JS Yet is a JavaScript book series maintained in an official public repository.
Choose the volume related to a concept you find difficult, such as scope, types or asynchronous behavior. The repository separates those subjects, supporting deeper study after a first JavaScript introduction. Pay attention to the edition and branch so your reading notes refer to the same text as a discussion or example. The second-edition README marks Objects & Classes as a stable draft and Types & Grammar as a rough draft. Sync & Async and ES.Next & Beyond are cancelled, so do not plan on a complete second-edition set of those volumes. Online reading is free; the text licence is CC BY-NC-ND 4.0.