Comments on: Further understanding scala.Option

By: ziggy

ziggy — Wed, 31 Aug 2011 15:19:21 +0000

This is really fun stuff. Looking forward to the follow up exercises. Writing a scala file with fill in the blanks is a brilliant idea. Thank you.

By: λ Tony’s blog λ » Blog Archive » Even Further Understanding scala.Option (part 2)

Wed, 01 Sep 2010 05:45:34 +0000

[...] a follow-on to Further Understanding scala.Option, following are another 10 exercises (numbered 16 to 25). Included are solutions to the original 1 [...]

By: Channing Walton

Channing Walton — Fri, 27 Aug 2010 09:29:43 +0000

Hi Tony,

thanks for the exercise. I’ve noticed that for the 15th exercise, the test does not seem to generate a case for some.applic(none) which gave me the illusion that I had succeeded in producing a very short solution.

Channing

By: Tony Morris

Tony Morris — Mon, 23 Aug 2010 22:40:32 +0000

Hi Andreas,
Email me privately and I’ll help you out. I don’t want to give it away for others

By: Andreas

Andreas — Mon, 23 Aug 2010 13:56:22 +0000

An interesting exercise. I managed to solve all; but exercise 15 took me some time. I found 4 different solutions ranging from 60 to 28 characters but nowhere near the short solution(s) some people on the mailing list have found I’m eager to see the sample solution

By: Alf

Alf — Mon, 23 Aug 2010 08:16:35 +0000

Thanks for the exercises, enlightening.

Managed to get all tests are passing. Anywhere I can get your solutions?

By: Tony Morris

Tony Morris — Mon, 23 Aug 2010 07:00:51 +0000

Thanks Michael. Fixed now.

By: Michael Bayne

Michael Bayne — Mon, 23 Aug 2010 04:30:59 +0000

I suspect that this property:

val prop_getOrElse = forAll ((o: Optional[Int], n: Int) =>
(o getOrElse n) == (o getOrElse n))

should use:

(o getOrElse n) == (o.toOption getOrElse n))