croma v0.9.2 Croma.ListMonad View Source
Implementation of Croma.Monad
interface for built-in lists.
This empowers the following Haskell-ish syntax for loops using lists:
iex> use Croma
...> Croma.ListMonad.m do
...> i <- [1, 2, 3]
...> j <- [10, 20]
...> pure i + j
...> end
[11, 21, 12, 22, 13, 23]
Link to this section Summary
Functions
Default implementation of Applicative’s ap
operation.
Modules that implement Croma.Monad
may override this default implementation.
Note that the order of arguments is different from the Haskell counterpart, in order to leverage Elixir’s pipe operator |>
Implementation of bind
operation of Monad.
Alias to Enum.flat_map/2
A macro that provides Hakell-like do-notation
Default implementation of Functor’s fmap
operation.
Modules that implement Croma.Monad
may override this default implementation.
Note that the order of arguments is different from the Haskell counterpart, in order to leverage Elixir’s pipe operator |>
Implementation of pure
operation of Monad (or Applicative).
Wraps the given value into a list
Converts the given list of monadic (to be precise, applicative) objects into a monadic object that contains a single list.
Modules that implement Croma.Monad
may override this default implementation
Link to this section Types
Link to this section Functions
Default implementation of Applicative’s ap
operation.
Modules that implement Croma.Monad
may override this default implementation.
Note that the order of arguments is different from the Haskell counterpart, in order to leverage Elixir’s pipe operator |>
.
Implementation of bind
operation of Monad.
Alias to Enum.flat_map/2
.
A macro that provides Hakell-like do-notation.
Examples
MonadImpl.m do
x <- mx
y <- my
pure f(x, y)
end
is expanded to
MonadImpl.bind(mx, fn x ->
MonadImpl.bind(my, fn y ->
MonadImpl.pure f(x, y)
end)
end)
Default implementation of Functor’s fmap
operation.
Modules that implement Croma.Monad
may override this default implementation.
Note that the order of arguments is different from the Haskell counterpart, in order to leverage Elixir’s pipe operator |>
.
Implementation of pure
operation of Monad (or Applicative).
Wraps the given value into a list.
Converts the given list of monadic (to be precise, applicative) objects into a monadic object that contains a single list.
Modules that implement Croma.Monad
may override this default implementation.
Examples (using Croma.Result)
iex> Croma.Result.sequence([{:ok, 1}, {:ok, 2}, {:ok, 3}])
{:ok, [1, 2, 3]}
iex> Croma.Result.sequence([{:ok, 1}, {:error, :foo}, {:ok, 3}])
{:error, :foo}