I should note that Either, Left and Right are not the only names you could use, so try not to be put off by the names.
On Wed, Sep 22, 2010 at 1:34 PM, Kevin Wright <[email protected]>wrote: > Lets compare... > > Apologies for using Scala, my intent here is to demonstrate the differences > in the techniques using a language that supports both styles, not > specifically to advocate Scala. > > val fileName = """c:\autoexec.bat""" > > // using either > fileOpen(fileName) match { > case Left(handle) => doSomethingWithFile(handle) > case Right(error) => logError(error) > } > > //using try/catch > try { > val handle = fileOpen(fileName) > doSomethingWithFile(handle) > } catch { > case Exception(e) => logError(e) > } > > > The try/catch example has a couple of extra lines, but that's hardly > significant. More importantly, as the amount of code grows between the try > and the catch, possible points of divergence for control flow become > increasingly unclear. This is high-risk for > causing maintenance difficulties in the future. using Either, on the other > hand, suggests that "file found" and "file not found" are equally valid > non-exceptional outcomes, and places them on a level footing as regards the > flow of control. > > On 22 September 2010 13:19, Ricky Clarkson <[email protected]>wrote: > >> The point is that it's your choice what to do. Using Either does not mean >> you have to write lots of if statements, though you can if you like. >> >> >> On Wed, Sep 22, 2010 at 12:22 PM, Miroslav Pokorny < >> [email protected]> wrote: >> >>> How is either any better than letting catching an exception or letting >>> the code continue in the original spot. One gets a split off into a >>> everythings ok here a file, or jump to there and process the problem ? Using >>> Either ends up being "more" code because we get the branch for free with >>> exceptions...And given FileCreation failed is an exception the flow will be >>> most likely at least a bit different. Continuing on and checking later does >>> not seem to make much sense most of the time. >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "The Java Posse" group. >>> To post to this group, send email to [email protected]. >>> To unsubscribe from this group, send email to >>> [email protected]<javaposse%[email protected]> >>> . >>> For more options, visit this group at >>> http://groups.google.com/group/javaposse?hl=en. >>> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "The Java Posse" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]<javaposse%[email protected]> >> . >> For more options, visit this group at >> http://groups.google.com/group/javaposse?hl=en. >> > > > > -- > Kevin Wright > > mail / gtalk / msn : [email protected] > pulse / skype: kev.lee.wright > twitter: @thecoda > > -- > You received this message because you are subscribed to the Google Groups > "The Java Posse" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<javaposse%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/javaposse?hl=en. > -- You received this message because you are subscribed to the Google Groups "The Java Posse" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/javaposse?hl=en.
