Member variables in ES6 classes

Question

Is there any way to use the ECMAScript6 class notation to declare either a static class variable or a default value for an instance variable? Without clas

Answer 1

ES6 will almost certainly not cover syntax for defining class variables. Only methods and getters/setters can be defined using the class syntax. This means you'll still have to go the MyClass.classVariable = 42; route for class variables.

If you just want to initialize a class with some defaults, there is a rich new syntax set for function argument and destructuring defaults you can use. To give a simple example:

class Foo {
    constructor(foo = 123) {
        this.foo = foo;
    }
}

new Foo().foo == 123
new Foo(42).foo == 42