vʌvr (formerly called Javaslang) is a non-commercial, non-profit object-functional library that runs with Java 8+. It aims to reduce the lines of code and increase code quality.
Thank you for all of the work on Vavr! It has quickly become my favorite Java library, and usually the first thing I add to every new project ❤️ Aside from the benefit to my own code, it has also been a great tool to help teach others about FP and get them curious about it.
Proposal / What is this?
I come across cases where I want to convert a Try to an Either while mapping the Failure value onto a Left value.
One example would be safely handling code which isn't mine, then mapping the Throwable onto an error type.
I do this normally either with fold(throwableMapper, identity()) or .toEither().mapLeft(throwableMapper), but find that .toEither(throwableMapper) would be a nice shortcut to replace either case.
I have also a few colleagues who would appreciate the addition from a readability standpoint I think, so I thought I'd suggest it.
Implementation
By my own style, I'd normally just write this as a wrapper around a fold call. However, as a first contribution, I am trying to stick as close as possible to the style I already see in the code here.
By that reasoning, the code style, namings, and Javadoc are all created based on examples I find existing within the file.
Since the toEither(Supplier) implementation assumes the Supplier is pure/will not throw an exception and does not handle such a case, I have followed the same assumption here as well.
Thank You
Thank you for all of the work on Vavr! It has quickly become my favorite Java library, and usually the first thing I add to every new project ❤️ Aside from the benefit to my own code, it has also been a great tool to help teach others about FP and get them curious about it.
Proposal / What is this?
I come across cases where I want to convert a
Tryto anEitherwhile mapping theFailurevalue onto aLeftvalue. One example would be safely handling code which isn't mine, then mapping theThrowableonto an error type.I do this normally either with
fold(throwableMapper, identity())or.toEither().mapLeft(throwableMapper), but find that.toEither(throwableMapper)would be a nice shortcut to replace either case. I have also a few colleagues who would appreciate the addition from a readability standpoint I think, so I thought I'd suggest it.Implementation
By my own style, I'd normally just write this as a wrapper around a
foldcall. However, as a first contribution, I am trying to stick as close as possible to the style I already see in the code here.By that reasoning, the code style, namings, and Javadoc are all created based on examples I find existing within the file.
Since the
toEither(Supplier)implementation assumes theSupplieris pure/will not throw an exception and does not handle such a case, I have followed the same assumption here as well.