Add callback for map/reduce capability on actions about refluxjs

[andreypopp]

my 2 cents here: I think actions is the place where additional validations might be useful, so what do you think if when creating actions developer can specify arg type validation, similar to propTypes in React.

[spoike]

@andreypopp I wonder if it is just easier to do the function approach anyway... and add a validator composer. E.g. like this:

// composing validator
var validatorFunc = Reflux.createValidator(
    Reflux.validators.isNumberIntervalOf(0, 100), 
    Reflux.validators.isNot(1));
// attach validator to action
var action = Reflux.createAction(validatorFunc);

Alternatively put that into the shouldEmit hook instead.

// attach validator to action
var action = Reflux.createAction();
action.shouldEmit = validatorFunc;

Also validators may need to "throw an error" by invoking relevant action(s) for an error handling flow. Probably add that to the validator as parameter:

// ErrorAction(s) defined earlier
var validatorFunc = Reflux.createValidator(
    Reflux.validators.isNot(-1, ErrorAction.wrongNumberOnTextField)
);

Does this make sense to you all?

[spoike]

Krawaller has implemented the passthrough on preEmit in #78 which is included in 0.1.8.

Closing this issue now, since I'm pretty sure you can use 3rd party argument matchers in javascript. So I'm dropping the idea for now until someone comes with a really good idea for validator implementation.