Convenience Method for running Promises on Main Thread about promisekit

[mxcl]

then by default runs on the main thread. Would that work?

Generally I didn't expect dispatch_promise to be that often used.

[mxcl]

Like, really dispatch_promise is not the usual way to start a promise. The documentation just happens to do it that way as the first example.

[ethanmick]

Is the main way you expect promises to be created is through [Promise new:]? Which does run on the main thread.

[mxcl]

dispatch_promise is just a convenience function that runs the provided block on a specific dispatch_queue and returns a promise. The block executed by +new: executes immediately in the queue new is called in.

[mxcl]

Usually you would wrap the +new: in another method so the resulting usage reads better. Like this:

if (![self isOpponentDead])
    return;

[self opponentFaint].then(^{
    NSString *text = [NSString stringWithFormat:@"%@ fainted!", self.currentOpponent.name];
    return [self showText:text];
}).then(^{
    NSInteger expGain = [self.currentOpponent experienceGainedWhenDefeated];
    NSDictionary *levelInfo = [self.currentPlayer gainExperience:expGain];

    /// if you grew a level OR if you need to delete a move, do all that.

    NSString *exp = [NSString stringWithFormat:@"%@ got %d exp points!", self.currentPlayerGuy.name, expGain];
    return [self showText:exp];
}).then(^{
    if (levelInfo == nil) {
        [self opponentSendOutNext].then(^(NSNumber *didSendOut){
            if (!didSendOut.boolValue) {
                [self opponentLosingSequence];
            } else {
                [self emptyMoveQueue];
                [self showMainMenu];
            }
        });
    } else {
        NSString *lvlUp = [NSString stringWithFormat:@"%@ grew to level %d!", self.currentPlayerGuy.name, self.currentPlayerGuy.level.integerValue];
        [self updateLabels:NO];
        [self showText:lvlUp].then(^{
            //etc.
        });
    }
});

[ethanmick]

Alright, that sounds good. I'll change how my promises start. Thank you!