async

function

Create a compute that can set its value after the computed function has been called.

`compute.async(initialValue, computed(currentValue, setValue(newValue) )`

Parameters

The {*}:
initial value of the compute.
computed {asyncComputer(lastSetValue, setVal)}:
A function that returns the current value of the compute and can optionally later call its setValue callback to update the value.

Returns

{compute(newVal)}:

Returns a compute, but a compute that will possibly not have the correct value unless it is bound to.

Use

The following compute is a live list of todos for a given userId. todos value would alternate between null and a Todo.List as userId changes.

var userId = compute(5)

var todos = compute.async(null, function(oldTodoList, setValue){
  Todo.findAll({ userId: userId() }, function(todos){
    setValue(todos)
  });
  return null;
});

The following replaces the list in place:

var userId = compute(5)

var todos = compute.async(new Todo.List(), function(todoList, setValue){
  todoList.replace( Todo.findAll({ userId: userId() })
  return todoList;
});