Remember, we cannot see the Smalltalk exercises in exercism. We cannot help you without knowing what problem you are trying to solve. Is this problem basically the same as https://www.reddit.com/r/dailyprogrammer/comments/3ntsni/20151007_challenge_... or is it different? Double dispatch is a programming technique, not an end in itself. A weird thing about the exercism site is that you can see *solutions* to problems for a language even if you cannot see the *problems* themselves. So I have seen *solutions* to Bowling in several languages; some with no objects at all, and some using single dispatch only. This is a 'medium' problem, meaning the solution is maybe 2 or 3 pages. KEEP IT SIMPLE. Not every *concept* needs to be a *class*. On Sat, 6 Apr 2019 at 21:53, Roelof Wobben <r.wobben@home.nl> wrote:

Hello,

Just thinking how to solve the bowling challenge from exercism.

but I wonder if I can do something like this in the method that checks if I have the right object

I was thinking about this :

Result -- Strike -- Spare -- allOther

then In Strike something like this

checkForBonus: number1 score2: number2 ^ number1 + number2 == 10

or am I thinking the totally wrong way to solve this?

Roelof