The ES6 spec states that calling the send method on a generator should result in an object. So long as the generator is yielding more values, the object is { value: v, done: false } where v is the value yielded. When the generator stops, the object is { value: undefined, done: true }. Firefox has had a preliminary implementation of generators th…

es6-generators-stopiteration.js

this.Generator && (function(g, global) {
  var __send = g.prototype.send;
  g.prototype.send = function send(value) {
    var result = __send.call(this, value);
    if (result.done) {
      throw new StopIteration();
    }
    return result.value;
  };
  
  function StopIteration(message) {
    this.message = message;
  }
  StopIteration.prototype = new global.Error();
  StopIteration.prototype.constructor = StopIteration;
  StopIteration.prototype.name = "StopIteration";
  
  global.StopIteration = StopIteration;
})(this.Generator, this);