ES6 Harmony do ES5


repo: https://github.com/google/traceur-compiler
ako to funguje: https://github.com/google/traceur-compiler/wiki/CompilingOffline
pre kontrolu: http://www.es6fiddle.net/

ukazky ES6 snippetov
https://github.com/JustinDrake/node-es6-examples
...
Let's start with let. You can think of let as a block-scoped variation of var for variable declaration.

{ let a = 'I am declared inside an anonymous block'; }

console.log(a); // ReferenceError: a is not defined