Things re-invented in JS (and by most language communities as they evolve): - Build systems - Dependency management - Some form of code modularity and re

Things re-invented in JS (and by most language communities as they evolve): - Build systems - Dependency management - Some form of code modularity and references between modules - Preprocessing/macros/templating - Source to source - DSL embedding - Compartmentalization of state (globals bad) - More advanced type systems - OO-ish systems - Forms of data flow - Message passing - Functional style (including limiting mutability) - Forms of control flow - Frameworks providing more magic - Calls for less magic and more explicit control flow - Exception handling good - Explicit errors better - Event loops ...