Feature Request: Always/Finally action

[jacob-pro]

Hi,

I am planning to move to RXPromise from PromiseKit because of the good support for cancellation.

I was wondering if you could give me any recommendations for how to implement an always/finally block that will execute regardless of whether the promise was successful or not?

Thanks

[jacob-pro]

This is what I have done:

#import <RXPromise/RXPromise.h>

@interface RXPromise (Always)

//always - No parameters because we don't know if it has failed or suceeded
//No value can be returned, the chain will maintain continue in its original state

typedef void (^promise_alwaysHandler_t)(void);

typedef RXPromise* (^always_block_t)(promise_alwaysHandler_t);

@property (nonatomic, readonly) always_block_t always;

@end

@implementation RXPromise (Always)

- (always_block_t) always {
	return ^RXPromise*(promise_alwaysHandler_t onalways) {
		return self.then(^id(id result){
			onalways();
			return result;
		}, ^id(NSError* error){
			onalways();
			return error;
		});
		
	};
}

(And then repeat for alwaysOn etc)