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.
>>
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Kevin Wright
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