Chain - An easy way to chain functions that return ok/error tuples

[kokolegorille]

There is also ok library, by @Crowdhailer

OK - elegant error handling with result monads (alternative to Elixir `with` special form)

Experimenting with this code. OK.try do user <- fetch_user(1) cart <- fetch_cart(1) order = checkout(cart, user) save_order(order) end Ok.with/1 supports an else block that can be used for handling error values. OK.with do a <- safe_div(8, 2) _ <- safe_div(a, 0) else :zero_division -> # matches on reason {:ok, :inf} # must return a new success or failure end The cart example above is equivalent to with {:ok, user} <- fetch_user(1), {:ok, cart} <- fetch_cart(1), …