fibers.js

//fibers
function markComplete(postedItems, completionCallback) {
  var errors = [];
 
  var getItemToUpdate = function(item) {
    var fiber = Fiber.current;
    process.nextTick(function() {
      client.queryEntity('tasks', 'partition1', item, function(err, task) {
        fiber.run(task);
      });
    });
    return Fiber.yield();
  };
 
  Fiber(function() {
    postedItems.forEach(function(item) {
      task = getItemToUpdate(item);
      console.log(task);
    });
    completionCallback(undefined);
  }).run();
}

You can pass task directly from fiber.run to Fiber.yield. So you don't need an extra variable to pass the result.

You could also improve by adding a try/catch and using fiber.throwInto to propagate it.

See https://github.com/Sage/streamlinejs/blob/master/lib/fibers/runtime.js#L114-151 for a complete example

Aaah, i saw I could pass to run but didn't realize I can return the yield and it would flow through. OK on the try/catch.

Thanks!
Glenn