Hi,
MissingValue (or NoValue) is definitely the way to go. The UniformOrderedCollection is an interesting idea, too. We had a NoValue like solution a long time ago but we discarded because we missed the idea around collections. It would be really cool to have this working.
Cheers, Doru
On Dec 20, 2016, at 10:15 PM, stepharong stepharong@free.fr wrote:
Hi dear great OO designers
Here is a little challenges for your brainy souls :)
In Moose when we compute metrics it may happen than a tool (often external to pharo) does not compute a metrics and when we request it in moose we check and often we return a not so good -1.
I'm trying to brainstorm on a solution
first may be the simplest way is to not invoke a metrics when it is not computed. But it means that we should know it and that we should have a registration mechanism. After all this is probably the best solution.
Second we were thinking to use exception but when we have multiple entities missing one metrics.... I have serious doubts.
Second I was thinking about having the following behavior
testCollect
| uarray collected | uarray := UniformOrderedCollection new. uarray add: 10. uarray add: 20. uarray add: (MissingValue discarding). collected := uarray collect: [ :each | each ]. self assert: collected size equals: 2.
testDo
| res uarray | uarray := UniformOrderedCollection new. uarray add: 10. uarray add: 20. uarray add: (MissingValue discarding). uarray add: 40. res := 0. uarray do: [ :each | res := res + each ]. self assert: res equals: 70.
testCollectDefaulting
| uarray collected | uarray := UniformOrderedCollection new. uarray add: 10. uarray add: 20. uarray add: (MissingValue default: 33). collected := uarray collect: [ :each | each ]. self assert: collected size equals: 3. self assert: collected third equals: 33
I basically started to implement
do: aBlock "Refer to the comment in Collection|do:." 1 to: self size do: [:index | (self at: index) toDo: aBlock on: self]
collect: aBlock "Evaluate aBlock with each of the receiver's elements as the argument. Collect the resulting values into a collection like the receiver. Answer the new collection."
| newCollection | newCollection := self species new. self do: [ :each | each toCollect: aBlock on: newCollection ]. ^ newCollection
and
DiscardingValue >> toCollect: aBlock on: aCollection "discard computation" ^ self
Object >> toCollect: aBlock on: aCollection
^ aCollection add: (aBlock value: self)
So I imagine that you see the design and I wanted to get your point of view.
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