whatever.map(....).openOr(..) is the usual idiom, however, you could of course
use parameter extraction if that floats your boat / is appropriate.
Cheers, Tim
On 23 Dec 2009, at 23:11, Jim Wise wrote:
> Oh, I see -- because x.map(foo) where x is a Box returns a Box which
> is Empty/Error or Full(foo(a.open)) depending on whether x was Full.
>
> Thank you!
>
> Sent from my iPhone
>
> On Dec 23, 2009, at 17:06, Ross Mellgren <dri...@gmail.com> wrote:
>
>> Normally you'd probably do something like
>>
>> i.category.obj.map(_.name).openOr("unknown category!")
>>
>> That is, if I have a category object give me its name, otherwise give
>> me "unknown category!"
>>
>> Also, if you have to collect the result a bunch of possibly-failing
>> computations (like looking up the category can fail) then remember
>> that the for comprehension is your friend.
>>
>> -Ross
>>
>> On Dec 23, 2009, at 4:45 PM, Jim Wise wrote:
>>
>>> Jim Wise <jw...@draga.com> writes:
>>>
>>>> "category" ->
>>>> i.category.obj.open_!.name, // XXX safe unless key rel is
>>>> corrupt ?
>>>> AttrBindParam("imgUrl", i.url, "src")
>>>
>>> And, since I'm looking at this code, what's the safe way to do this
>>> (i.e. can I avoid the open_!)?
>>>
>>> --
>>> Jim Wise
>>> jw...@draga.com
>>
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