Chain

A library that mimics the JavaScript Promise API, but only as a synchronous way to organise code.

Installation

Chain is available in Hex, the package can be installed by adding chain to your list of dependencies in mix.exs:

def deps do
  [
    {:chain, "~> 0.1.0"}
  ]
end

Documentation can be generated with ExDoc and published on HexDocs. Once published, the docs can be found at https://hexdocs.pm/chain.

Usage

A Chain is a list of steps to run sequentially. Each next step gets the previous result as parameter and if returns {:ok, value} or value then value goes to the next next step in line. If it returns a {:error, reason} tuple, then reason goes to the next recover step in line.

chain_result =
  initial_value
  |> Chain.new()
  |> Chain.next(&do_some_work/1)
  |> Chain.next(&do_some_more_work/1)
  |> Chain.recover(&recover_some_error/1)
  |> Chain.run()

License

Licensed under the MIT License. See License file.