Rustic Result

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Result monad for Elixir inspired by Rust Result type.

Installation

This package can be installed by adding rustic_result to your list of dependencies in mix.exs:

def deps do

  [

    {:rustic_result, "~> 0.1.0"}

  ]

end

Usage

import Rustic.Result



ok(42)

# {:ok, 42}



err(:not_found)

# {:error, :not_found}



ok(1) |> and_then(fn v -> ok(v + 1) end)

# ok(2)



ok(1) |> and_then(fn _ -> err(:not_found) end)

# err(:not_found)



err(:not_found) |> and_then(fn v -> ok(v + 1) end)

# err(:not_found)



ok(1) |> or_else(fn _ -> ok(2) end)

# ok(2)



err(:not_found) |> or_else(fn :not_found -> ok(1) end)

# ok(1)



err(:not_found) |> or_else(fn :not_found -> err(:invalid) end)

# err(:invalid)



ok(1) |> unwrap!()

# 1



err(:not_found) |> unwrap!()

# ** (Rustic.Result.UnhandledError) Expected an ok result, ":not_found" given.