On Tuesday, September 16, 2014, Ep Ga <epg...@gmail.com> wrote:
> Rick, copy and paste in Firefox--the ones who are most involve in the spec
> direction--:
>
> function r(){
> var i = 0, a = [0,9,8,7,6,5,4,3,2,1];
> return (function (){return a.pop();});
> }
>
> var rr = r();
>
> function y(){
> let i = 0, a = [0,9,8,7,6,5,4,3,2,1];
> while(a){
> yield (a.pop());
> }
> }
>
>
Firefox implemented `yield` in normal functions during ES4 prototyping era.
It's non-standard, it's wrong and it's not part of ES6. I'm losing patience
for this discussion.
> let yy = y();
>
> function* g(){
> let i = 0, a = [0,9,8,7,6,5,4,3,2,1];
> while(a){
> yield (a.pop());
> }
> }
Why would you _ever_ do this? `a` will always evaluate truthy. Writing an
intentionally broken program is not a valid argument against anything.
> let gg = g();
>
> console.log("return: " + rr() + " " + rr() + " " + rr() + " " + rr() + " "
> + rr() + " " + rr() + " " + rr() + " " + rr() + " " + rr() + " " + rr() + "
> " + rr() + "\n" +
> "yield: " + yy.next() + " " + yy.next() + " " + yy.next() + " " +
> yy.next() + " " + yy.next() + " " + yy.next() + " " + yy.next() + " " +
> yy.next() + " " + yy.next() + " " + yy.next() + " " + yy.next() + "\n" +
> "function*: " + JSON.stringify([gg.next(), gg.next(), gg.next(),
> gg.next(), gg.next(), gg.next(), gg.next(), gg.next(), gg.next(),
> gg.next(), gg.next()]));
>
> /*
> return: 1 2 3 4 5 6 7 8 9 0 undefined
> yield: 1 2 3 4 5 6 7 8 9 0 undefined
> function*:
> [{"value":1,"done":false},{"value":2,"done":false},{"value":3,"done":false},{"value":4,"done":false},{"value":5,"done":false},{"value":6,"done":false},{"value":7,"done":false},{"value":8,"done":false},{"value":9,"done":false},{"value":0,"done":false},{"done":false}]
> */
>
>
Clearly you don't understand the history of iterator and generator design,
but read this and please move on:
https://github.com/rwaldron/tc39-notes/blob/master/es6/2013-03/mar-12.md
(Look for StopIteration)
Rick
>
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