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join :: Monad m => m (m a) -> m a

base Control.Monad

The join function is the conventional monad join operator. It is used to remove one level of monadic structure, projecting its bound argument into the outer level. 'join bss' can be understood as the do expression
```
do bs <- bss
bs
```
Examples
```
>>> join [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
[1,2,3,4,5,6,7,8,9]
```
```
>>> join (Just (Just 3))
Just 3
```
A common use of join is to run an IO computation returned from an STM transaction, since STM transactions can't perform IO directly. Recall that
```
atomically :: STM a -> IO a
```
is used to run STM transactions atomically. So, by specializing the types of atomically and join to
```
atomically :: STM (IO b) -> IO (IO b)
join       :: IO (IO b)  -> IO b
```
we can compose them as
```
join . atomically :: STM (IO b) -> IO b
```
to run an STM transaction and the IO action it returns.
join :: Monad m => m (m a) -> m a

base GHC.Base

The join function is the conventional monad join operator. It is used to remove one level of monadic structure, projecting its bound argument into the outer level. 'join bss' can be understood as the do expression
```
do bs <- bss
bs
```
Examples
```
>>> join [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
[1,2,3,4,5,6,7,8,9]
```
```
>>> join (Just (Just 3))
Just 3
```
A common use of join is to run an IO computation returned from an STM transaction, since STM transactions can't perform IO directly. Recall that
```
atomically :: STM a -> IO a
```
is used to run STM transactions atomically. So, by specializing the types of atomically and join to
```
atomically :: STM (IO b) -> IO (IO b)
join       :: IO (IO b)  -> IO b
```
we can compose them as
```
join . atomically :: STM (IO b) -> IO b
```
to run an STM transaction and the IO action it returns.
join :: Monad m => m (m a) -> m a

rio RIO.Prelude

The join function is the conventional monad join operator. It is used to remove one level of monadic structure, projecting its bound argument into the outer level. 'join bss' can be understood as the do expression
```
do bs <- bss
bs
```
Examples
```
>>> join [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
[1,2,3,4,5,6,7,8,9]
```
```
>>> join (Just (Just 3))
Just 3
```
A common use of join is to run an IO computation returned from an STM transaction, since STM transactions can't perform IO directly. Recall that
```
atomically :: STM a -> IO a
```
is used to run STM transactions atomically. So, by specializing the types of atomically and join to
```
atomically :: STM (IO b) -> IO (IO b)
join       :: IO (IO b)  -> IO b
```
we can compose them as
```
join . atomically :: STM (IO b) -> IO b
```
to run an STM transaction and the IO action it returns.
join :: Monad m => m (m a) -> m a

Cabal-syntax Distribution.Compat.Prelude

No documentation available.
join :: Monad m => m (m a) -> m a

relude Relude.Monad.Reexport

The join function is the conventional monad join operator. It is used to remove one level of monadic structure, projecting its bound argument into the outer level. 'join bss' can be understood as the do expression
```
do bs <- bss
bs
```
Examples
```
>>> join [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
[1,2,3,4,5,6,7,8,9]
```
```
>>> join (Just (Just 3))
Just 3
```
A common use of join is to run an IO computation returned from an STM transaction, since STM transactions can't perform IO directly. Recall that
```
atomically :: STM a -> IO a
```
is used to run STM transactions atomically. So, by specializing the types of atomically and join to
```
atomically :: STM (IO b) -> IO (IO b)
join       :: IO (IO b)  -> IO b
```
we can compose them as
```
join . atomically :: STM (IO b) -> IO b
```
to run an STM transaction and the IO action it returns.
join :: Monad m => m (m a) -> m a

streaming Streaming

The join function is the conventional monad join operator. It is used to remove one level of monadic structure, projecting its bound argument into the outer level. 'join bss' can be understood as the do expression
```
do bs <- bss
bs
```
Examples
```
>>> join [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
[1,2,3,4,5,6,7,8,9]
```
```
>>> join (Just (Just 3))
Just 3
```
A common use of join is to run an IO computation returned from an STM transaction, since STM transactions can't perform IO directly. Recall that
```
atomically :: STM a -> IO a
```
is used to run STM transactions atomically. So, by specializing the types of atomically and join to
```
atomically :: STM (IO b) -> IO (IO b)
join       :: IO (IO b)  -> IO b
```
we can compose them as
```
join . atomically :: STM (IO b) -> IO b
```
to run an STM transaction and the IO action it returns.
join :: Monad m => m (m a) -> m a

base-compat-batteries Control.Monad.Compat

The join function is the conventional monad join operator. It is used to remove one level of monadic structure, projecting its bound argument into the outer level. 'join bss' can be understood as the do expression
```
do bs <- bss
bs
```
Examples
```
>>> join [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
[1,2,3,4,5,6,7,8,9]
```
```
>>> join (Just (Just 3))
Just 3
```
A common use of join is to run an IO computation returned from an STM transaction, since STM transactions can't perform IO directly. Recall that
```
atomically :: STM a -> IO a
```
is used to run STM transactions atomically. So, by specializing the types of atomically and join to
```
atomically :: STM (IO b) -> IO (IO b)
join       :: IO (IO b)  -> IO b
```
we can compose them as
```
join . atomically :: STM (IO b) -> IO b
```
to run an STM transaction and the IO action it returns.
join :: Monad m => m (m a) -> m a

ghc-internal GHC.Internal.Base

The join function is the conventional monad join operator. It is used to remove one level of monadic structure, projecting its bound argument into the outer level. 'join bss' can be understood as the do expression
```
do bs <- bss
bs
```
Examples
```
>>> join [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
[1,2,3,4,5,6,7,8,9]
```
```
>>> join (Just (Just 3))
Just 3
```
A common use of join is to run an IO computation returned from an STM transaction, since STM transactions can't perform IO directly. Recall that
```
atomically :: STM a -> IO a
```
is used to run STM transactions atomically. So, by specializing the types of atomically and join to
```
atomically :: STM (IO b) -> IO (IO b)
join       :: IO (IO b)  -> IO b
```
we can compose them as
```
join . atomically :: STM (IO b) -> IO b
```
to run an STM transaction and the IO action it returns.
join :: Monad m => m (m a) -> m a

ghc-internal GHC.Internal.Control.Monad

The join function is the conventional monad join operator. It is used to remove one level of monadic structure, projecting its bound argument into the outer level. 'join bss' can be understood as the do expression
```
do bs <- bss
bs
```
Examples
```
>>> join [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
[1,2,3,4,5,6,7,8,9]
```
```
>>> join (Just (Just 3))
Just 3
```
A common use of join is to run an IO computation returned from an STM transaction, since STM transactions can't perform IO directly. Recall that
```
atomically :: STM a -> IO a
```
is used to run STM transactions atomically. So, by specializing the types of atomically and join to
```
atomically :: STM (IO b) -> IO (IO b)
join       :: IO (IO b)  -> IO b
```
we can compose them as
```
join . atomically :: STM (IO b) -> IO b
```
to run an STM transaction and the IO action it returns.
join :: Monad m => m (m a) -> m a

protolude Protolude.Monad

The join function is the conventional monad join operator. It is used to remove one level of monadic structure, projecting its bound argument into the outer level. 'join bss' can be understood as the do expression
```
do bs <- bss
bs
```
Examples
```
>>> join [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
[1,2,3,4,5,6,7,8,9]
```
```
>>> join (Just (Just 3))
Just 3
```
A common use of join is to run an IO computation returned from an STM transaction, since STM transactions can't perform IO directly. Recall that
```
atomically :: STM a -> IO a
```
is used to run STM transactions atomically. So, by specializing the types of atomically and join to
```
atomically :: STM (IO b) -> IO (IO b)
join       :: IO (IO b)  -> IO b
```
we can compose them as
```
join . atomically :: STM (IO b) -> IO b
```
to run an STM transaction and the IO action it returns.

base	Control.Monad

base	GHC.Base

rio	RIO.Prelude

Cabal-syntax	Distribution.Compat.Prelude

relude	Relude.Monad.Reexport

streaming	Streaming

base-compat-batteries	Control.Monad.Compat

ghc-internal	GHC.Internal.Base

ghc-internal	GHC.Internal.Control.Monad

protolude	Protolude.Monad

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