I think let is supposed to replace var completely. There's a brief mention of this in a book I was reading the other day (Understanding ES6: https://leanpub.com

I think let is supposed to replace var completely. There's a brief mention of this in a book I was reading the other day (Understanding ES6: https://leanpub.com/understandinges6/read/ https://leanpub.com/understandinges6/read/ ) but no citation of where that decision comes from.