I think there's less difference than you imagine. In C# you might write:
repository.Save(account)
Whereas in Clojure:
(save repository account)
The parameter lists are wider in Clojure only because Clojure doesn't have
an explicit method call syntax.
- James
On 7 February 2015 at 16:07, Dru Sellers <d...@drusellers.com> wrote:
> Greetings,
>
> I am trying to convert my mind from OO (C#) to one more functionally
> friendly. I am increasingly comfortable with simple applications in
> clojure, but as I start to build more complex applications, I start to fall
> down about how to structure my application. I don't want to just shove OO
> ideas into the functional nature of Clojure. I'm looking for any help
> someone can provide to help shimmy my brain into the right mental patterns.
>
> Background: Long time C# developer who leans heavily on IoC / DI /
> Interfaces / Testing / Object Encapsulation.
>
>
> *Specific Question: Object Encapsulation*
> I feel like my function parameter lists are much "wider" than they would
> be in C#. This is due to the "lack" of a constructor. So if I previously
> had a C# class that looked like:
>
>
> public class AccountRepository : IAccountRepository
> {
> IDatabaseConnection _connection;
>
> public AccountRepository(IDatabaseConnection connection)
> {
> _connection = connection;
> }
>
> public void Save(Account account)
> {
> _connection.Execute("UPDATE accounts SET coupon=@coupon WHERE id=@id",
> { coupon = account.Coupon, id=account.Id});
> }
> }
>
> In the above I have encapsulated the "_connection", the other methods
> don't have to deal with it. In Clojure (especially if you are following
> Sierra's Component pattern) you end up with
>
> (defn save [db account]
> (update db (:coupon account) (:id account))
> )
>
> I end up having to pass this 'db' around all over the place. I think that
> this is just something I'll have to get used to more than anything. Am I
> missing anything?
>
> Thank you for your time.
>
> -d
>
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