@@new

[Allen Wirfs-Brock]

On Jun 18, 2014, at 1:43 PM, Brendan Eich wrote:

> Allen Wirfs-Brock wrote:
>>> Not so much to me, and one could argue for static [@@new](){} sugar similarly.
>> 
>> I think that fact that these really are semantically equivalent:
>> 
>>  function F(x) {this.foo=x};
>>  class F  {constructor(x) {this.foo=x}};
>> 
>> is pretty important to the evolutionary nature ES6 classes.
> 
> Jason covered the combinations: his proposal supports class subclassing function, etc. What concretely do you mean here, if not that? If you mean refactoring from one to the other, what observably differs?

My understanding of the proposal was that:

class F  {constructor(x) {this.foo=x}};

turns into the equivalent of:

function F(x) { /* ??? the initial message really isn't explicit about what does here */ };
F[Symbol.new] = {[Symbol.new](x) {  //use an object literal to create a "method" kind of function
    var obj = super();
    obj.foo = x
    }}[Symbol.new].toMethod(F);

which is quite different from you get for:

 function F(x) {this.foo=x};

allen