Anyone have a sane and performant way that they break out of a domain or
action such as middleware? I am trying to design such behavior but am faced
with a multitude of interesting issues. The classic example of this problem
can be seen with Array.prototype.forEach (though this has the easier
synchronous execution for breaking):
```javascript
// we only want to print first 2 items
[1, 2, 3].forEach(function (item) {
if (item > 2) {
return;
}
console.log(item);
});
```
We often see the error first callback cause a fast fail on waterfall style
control flow, but what if we are not issuing an error, but rather a
terminating condition (making all middleware after it ignored)? Right now
my only solution is to add another callback to arguments ala:
```javascript
function finish(creds, finish, next) {
if (creds == 'secret') finish(null, 'user/mary');
else next(null, creds);
}
actor.perform('auth', creds, finish, next);
```
This seems, a bit... overkill to type out though. Anyways, looking for
suggestions.
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