Class declarations

Brendan Eich brendan at
Fri Mar 16 15:50:42 PDT 2012

Brendan Eich wrote:
> We can defer these by deferring guards and const instance properties, 
> and tried to do so. But IIRC at least Waldemar was not happy leaving 
> writable instance properties usable (with default value undefined) 
> before being initialized.

Of course, Dart allows this and discloses null on use before initialization:

class Foo {
   var a;
   Foo(a) {
     this.a = a;
main() {
   var foo = new Foo(42);
   print('main: ' + foo.a);

Tested at


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