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#announcements
- s
spand
07/27/2017, 9:10 AMNo. Final fields must be initialized before the constructor ends - s
spand
07/27/2017, 9:10 AMWhy is it a problem that it is a
?var - n
natalia.wroblewska
07/27/2017, 9:11 AMfor example I have class Movie which in some cases have title and description, but sometimes I get only title. Gson would put null to description. I would like to give it an empty string, as a default if description is not in the response - k
karelpeeters
07/27/2017, 9:11 AMIt would be safer if it were a
, and that would also express the fact that it never changes better.val - d
diesieben07
07/27/2017, 9:11 AMAfaik Gson does not put null if the JSON does not have the field. - k
karelpeeters
07/27/2017, 9:13 AMWas just about to link this answer: https://stackoverflow.com/a/30216683/5517612 - v
v79
07/27/2017, 9:13 AMSometimes I think I'm too old; I can't think of many uses for val. All my programs exist to modify data 🙂. - n
natalia.wroblewska
07/27/2017, 9:17 AM@karelpeeters thanks I'll give it a try 🙂 - v
voddan
07/27/2017, 10:09 AM@v79
expresses that there is an exposed public field which may be changed at any time. We can discuss it further at #getting-startedvar lateinit - a
aaverin
07/27/2017, 11:42 AMHow to make a deep copy of the list in Kotlin?
doesn’t workArrayList(myList) - k
karelpeeters
07/27/2017, 11:43 AM
should do it.myList.map(Type::copy)💯 2 - a
aaverin
07/27/2017, 11:47 AMnice idea, thanks - p
ponzii
07/27/2017, 1:22 PMAs Kotlin has seamless interop with Java does that mean access to the Java gRPC api is also seamless? - k
kenkyee
07/27/2017, 2:32 PMthere has been no need for a Kotlin gRPC yet AFAIK, so that should be a good indicator 😉 - j
joelpedraza
07/27/2017, 3:01 PMIs there some metadata I can attach to a data class to prevent copy method generation? Or the inverse, can I get some of that sweet equals/hashCode/toString/componentN generation outside of using the data keyword? - k
karelpeeters
07/27/2017, 3:02 PMOut of curiosity, what's wrong with a
method?copy - j
joelpedraza
07/27/2017, 3:02 PMI'd like to be able to write single property wrappers that validate the input when they are created - j
joelpedraza
07/27/2017, 3:03 PMCopy would expose the private ctor - j
joelpedraza
07/27/2017, 3:05 PMExample use case: class Email(val address: String) should always represent a valid email, and the only public way of creating one should be by copying an exiting one, or a parse method that returns Either<ParseError, Email> - k
karelpeeters
07/27/2017, 3:05 PMRight, good point. - k
karelpeeters
07/27/2017, 3:06 PMWhat happens when you try to add your own private copy method? - j
joelpedraza
07/27/2017, 3:06 PMI was hoping you could tell me 😅 - j
joelpedraza
07/27/2017, 3:06 PMLet me dig a bit deeper - j
joelpedraza
07/27/2017, 3:08 PMError:(7, 5) Kotlin: Conflicting overloads: public final fun copy(emailAddress: String): EmailAddress defined in ksieve.EmailAddress - j
joelpedraza
07/27/2017, 3:08 PMadding override has an additional error, overrides nothing - j
joelpedraza
07/27/2017, 3:09 PMIn any case, I would want the copy signature to be copy(emailAddress: EmailAddress) - k
karelpeeters
07/27/2017, 3:09 PMHah was worth a shot I guess. - k
karelpeeters
07/27/2017, 3:10 PMThen I'm afraid you're out of luck, just let idea generate equals and hashcode for you. - j
joelpedraza
07/27/2017, 3:11 PMI wonder if there exists a sane way to implement it at the lang level - k
karelpeeters
07/27/2017, 3:12 PMI'd be happy with a
annotation.@NoCopy