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Don't take my answer for granted, but: 1. So far there have always been exams offered in the next semester after the lecture was held. It might be oral exams though, depending on the number of registrations. 2. I think it is always the case for FB20 lectures that bonus points are carried over until ...

Just in case you didn't find out already, the problems with Weblab have been fixed.

If you want to continue working until the problem is fixed, you can copy and paste the whole template + tests into your own IDE and continue working from there. For this task, all specification tests should be included in the public tests template.

Thanks for the feedback! Although I'm not one of the organizers of the lecture, I'm sure they appreciate it. :) In their defense however, the term "varargs", how to match them and even an example usage for the Seqn-case are already given in the template with a (probably not sufficiently detailed) co...

Sorry for the long delay, but maybe some explanation is still helpful for you or others: The *-parameters are not supposed to be regular expressions or something like this but simply a way to allow methods (or in our case case classes) to take an arbitrary number of arguments (the keyword if you wan...

Will there be a task over the winter pause? It would be awesome if there wasn't ;-) These tasks are getting increasingly complex and it would be nice having a pause for some time... Rest is for the dead! :wink: The next assignment will be just one big task that is quite a bit of coding work, but no...

Is your RBG account still active? It runs out every 6 months if you don't manually renew it.

https://support.rbg.informatik.tu-darmstadt.de/service

Just to make sure I understood this right: We are supposed to come up with two examples of higher order functions which have some nice functionality like map or fold for example? Map and fold are examples of functions you could implement (and use, in the tests you have to write), although probably ...

Well, using an explicit Scala placeholder probably won't work well here, either because Scala misunderstands it as a function definition (in your case, Scala thinks you want to write a syntactic short form of "(x) => { App([...], x) }"), or because the compiler would probably end up inserting "null"...

Don't worry, this has happened to the best of us. I hope you still learned something and I'm looking forward to giving you full score for your solution.

I actually answered that already with my code snippet as it contained def subst(expr: FAE, substId: Symbol, value: FAE): FAE = ... So let me return the question: Did we ever show you a substitution-based interpreter with dynamic scoping? :wink: By the way if your code is a good example, you can sure...

Did you definitely use '_ (starts with a single quotation mark and no space in between, to make it a symbol) instead of _ ? Please also make sure you don't confuse it with ´ or ` (the accent symbols). Scala can definitely handle the '_ symbol as any other symbol!

You don't have to worry about that "extends MultiArgFAE" part at all. It's just the name of the wrapper trait containing the FAE implementation, similar to the "object Solution" itself. If it helps your understanding, or you want to puzzle the necessary pieces together in your IDE, the internally us...

I'm having a lot of issues with WebLab; I'm aware that the system is not administered by TU Darmstadt, so I won't go into detailled bug descriptions or irritating design decisions here If you actually have serious issues, the place to post them is the official bug-tracker website . I guess the deve...

I also do not see, how it could make a difference. On page 29 of the PLAI book it is written "Because we agreed that environments are only an alternate implementation strategy for substitution—and in particular, that the language’s meaning should not change—". So i guess, maybe we found no differen...