ES6 class variable alternatives

Question

Currently in ES5 many of us are using the following pattern in frameworks to create classes and class variables, which is comfy:

Answer 1

Well, you can declare variables inside the Constructor.

class Foo {
    constructor() {
        var name = "foo"
        this.method = function() {
            return name
        }
    }
}

var foo = new Foo()

foo.method()