Variable shadowing sounds like a hacky way to solve problems caused by function scoping, which is solved in ES6 by introducing lexical scoping (i.e. the same sc

Variable shadowing sounds like a hacky way to solve problems caused by function scoping, which is solved in ES6 by introducing lexical scoping (i.e. the same scoping rules as in every other language). It's also worth pointing out that CS and ES6 aren't really comparable technologies. ES6 isn't some newfangled preprocessor that simplifies syntax, it's an update to the standard which JS adheres to. CS is fundamentally limited because it compiles to ES5.1. When ES6 is implemented in browsers, CS will be able to do more.