- 🤔 What is the use case for dry-monads?
- 😀 return either Success or Failure from some operation
From the dry-monads doc:
Monads provide an elegant way of handling errors, exceptions and chaining functions so that the code is much more understandable and has all the error handling without all the
ifs andelses
user = User.find_by(id: params[:id])
if user
address = user.address
end
if address
city = address.city
end
if city
state = city.state
end
if state
state_name = state.name
end
user_state = state_name || "No state"
After using dry-monads ✨
def find_user(user_id)
user = User.find_by(id: user_id)
if user
Success(user)
else
Failure(:user_not_found)
end
end
def find_address(address_id)
address = Address.find_by(id: address_id)
if address
Success(address)
else
Failure(:address_not_found)
end
end
This style of programming is called 🚃 Oriented Programming ( Railway Oriented Programming) - More info here!
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