On Wed, Sep 22, 2010 at 10:34 PM, Kevin Wright <kev.lee.wri...@gmail.com>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.
>
So how is adding lots of cases any clearer than adding lots of catches ?
Just about all the tokens and statements are in exactly the same place and
order, its just the "decorations" and syntax that looks different ? I cant
see how this could be said to be any clearer from the user of an api...
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