ES6 Classes Default Value

If you’re going to use ES6, why not use all of ES6, i.e. default values for parameters and destructuring assignment

class myClass {
  constructor({a="default a value", b = 'default b value', c="default c value"} = {a:'default option a', b:'default option b', c:'default option c'}) {
    this.a = a;
    this.b = b;
    this.c = c;
  }
}
var v = new myClass({a:'a value', b: 'b value'});
console.log(v.toSource());
var w = new myClass();
console.log(w.toSource());

http://www.es6fiddle.net/ibxq6qcx/

edit: also tested and confirmed to run on https://babeljs.io/repl/