Javascript's prototypes are more expressive than its classes, but still come short of Self on a few levels: 1. Self's prototypes support multiple delegation wh

Javascript's prototypes are more expressive than its classes, but still come short of Self on a few levels: 1. Self's prototypes support multiple delegation while JS objects only have one prototype (can be fixed with Proxies). 2. Javascript objects lack a universal clone method. 3. Self is entirely message based, while JS is property based.