forEach method

void forEach (void f(String key, dynamic value))

Implementation 

void forEach(void f(String key, dynamic value)) {
  var entries = JS('', '#.entries()', this);
  while (true) {
    var entry = JS('', '#.next()', entries);
    if (JS('bool', '#.done', entry)) return;
    f(JS('String', '#.value[0]', entry),
        convertNativeToDart_Dictionary(JS('', '#.value[1]', entry)));
  }
}