3 ms·

Haven't they already given up on backwards compatibility with things like => and for..of?

• phpnode 9y ago
  Those are additive, they don't affect the semantics of code that was written before they were added. That is what is meant by backwards compatibility here - you never need to change existing code because of new features.
  • z3t4 9y ago
    before es6 anything added also did not break existing implementations. eg you could run es5 features in a es4 engine using polyfill and progressive enhancement/degression. maybe its time for ES to add meta and overloading - although with a huge cost of complexity !?
• BillinghamJ 9y ago
  No? They're both backwards compatible.