Control.Monad.Rec.Loops

whileM :: forall m a. MonadRec m => m Boolean -> m a -> m (Array a)

Execute an action repeatedly as long as the given boolean expression returns true. The condition is evaluated before the loop body. Collects the results into an Array. See whileM' for a generalized Applicative monoidal result.

whileM' :: forall m f a. MonadRec m => Applicative f => Monoid (f a) => m Boolean -> m a -> m (f a)

Execute an action repeatedly as long as the given boolean expression returns true. The condition is evaluated before the loop body. Collects the results into an arbitrary Applicative monoidal structure.

whileM_ :: forall m a. MonadRec m => m Boolean -> m a -> m Unit

Execute an action repeatedly as long as the given boolean expression returns true. The condition is evaluated before the loop body. Ignores the results of loop body execution.

untilM :: forall m a. MonadRec m => m a -> m Boolean -> m (Array a)

Execute an action repeatedly until the condition expression returns true. The condition is evaluated after the loop body. Collects results into an Array.

untilM' :: forall m f a. MonadRec m => Applicative f => Semigroup (f a) => m a -> m Boolean -> m (f a)

Execute an action repeatedly until the condition expression returns true. The condition is evaluated after the loop body. Collects results into an arbitrary Applicative semigroupoid structure.

untilM_ :: forall m a. MonadRec m => m a -> m Boolean -> m Unit

Execute an action repeatedly until the condition expression returns true. The condition is evaluated after the loop body. Ignores the results of loop body execution.

iterateWhile :: forall m a. MonadRec m => (a -> Boolean) -> m a -> m a

Execute an action repeatedly until its result fails to satisfy a predicate, and return that result (discarding all others).

iterateUntil :: forall m a. MonadRec m => (a -> Boolean) -> m a -> m a

Execute an action repeatedly until its result satisfies a predicate, and return that result (discarding all others).

iterateUntilM :: forall m a. MonadRec m => (a -> Boolean) -> (a -> m a) -> a -> m a

Yields the result of applying f until p holds.

whileJust :: forall m b a. MonadRec m => m (Maybe a) -> (a -> m b) -> m (Array b)

As long as the supplied "Maybe" expression returns "Just _", the loop body will be called and passed the value contained in the 'Just'. Results are collected into an array.

whileJust' :: forall m f b a. MonadRec m => Applicative f => Monoid (f b) => m (Maybe a) -> (a -> m b) -> m (f b)

As long as the supplied "Maybe" expression returns "Just _", the loop body will be called and passed the value contained in the 'Just'. Results are collected into an arbitrary MonadPlus container.

whileJust_ :: forall m b a. MonadRec m => m (Maybe a) -> (a -> m b) -> m Unit

As long as the supplied "Maybe" expression returns "Just _", the loop body will be called and passed the value contained in the 'Just'. Results are discarded.

untilJust :: forall m a. MonadRec m => m (Maybe a) -> m a

Run the supplied "Maybe" computation repeatedly until it returns a value. Returns that value.

unfoldM :: forall m a. MonadRec m => m (Maybe a) -> m (Array a)

The supplied Maybe expression will be repeatedly called until it returns Nothing. All values returned are collected into an array.

unfoldM' :: forall m f a. MonadRec m => Applicative f => Monoid (f a) => m (Maybe a) -> m (f a)

The supplied Maybe expression will be repeatedly called until it returns Nothing. All values returned are collected into an Applicative Monoid.

unfoldM_ :: forall m a. MonadRec m => m (Maybe a) -> m Unit

The supplied Maybe expression will be repeatedly called until it returns Nothing. All values returned are discarded.

unfoldrM :: forall m b a. MonadRec m => (a -> m (Maybe (Tuple b a))) -> a -> m (Array b)

unfoldrM' :: forall m f b a. MonadRec m => Applicative f => Monoid (f b) => (a -> m (Maybe (Tuple b a))) -> a -> m (f b)

See 'Data.List.unfoldr'. This is a monad-friendly version of that, with a twist. Rather than returning a list, it returns any MonadPlus type of your choice.

andM :: forall m. MonadRec m => List (m Boolean) -> m Boolean

short-circuit 'and' for monadic boolean values.

orM :: forall m. MonadRec m => List (m Boolean) -> m Boolean

short-circuit 'or' for values of type Monad m => m Bool

anyPM :: forall a m. MonadRec m => List (a -> m Boolean) -> (a -> m Boolean)

short-circuit 'any' with a list of "monadic predicates". Tests the value presented against each predicate in turn until one passes, then returns True without any further processing. If none passes, returns False.

allPM :: forall m a. MonadRec m => List (a -> m Boolean) -> (a -> m Boolean)

short-circuit 'all' with a list of "monadic predicates". Tests the value presented against each predicate in turn until one fails, then returns False. if none fail, returns True.

anyM :: forall m a. MonadRec m => (a -> m Boolean) -> List a -> m Boolean

short-circuit 'any' with a "monadic predicate".

allM :: forall a m. MonadRec m => (a -> m Boolean) -> List a -> m Boolean

short-circuit 'all' with a "monadic predicate".