StackOverflow2013

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plurals

PO
primarykey
Id
19885564
data
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0
AnswerCount
0
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2013-11-10T02:26:05
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0
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2013-11-11T02:22:29.830
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2013-11-11T02:22:29.830
LastEditorUserId
442558
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442558
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19885157
PostTypeId
2
Score
6
ViewCount
0
LastEditorDisplayName
text
Body
There is a semigroup for things tagged with Tags.MinVal which selects the minimum val: <pre><code>scala> import scalaz._ ; import Scalaz._ ; import Tags._ import scalaz._ import Scalaz._ import Tags._ scala> MinVal(3).some |+| MinVal(1).some res0: Option[scalaz.@@[Int,scalaz.Tags.MinVal]] = Some(1) scala> MinVal(3).some |+| none[Int @@ MinVal] res1: Option[scalaz.@@[Int,scalaz.Tags.MinVal]] = Some(3) scala> none[Int @@ MinVal] |+| none[Int @@ MinVal] res2: Option[scalaz.@@[Int,scalaz.Tags.MinVal]] = None </code></pre> In the above, <code>Int @@ MinVal</code> is a type which is a subtype of <code>Int</code>, which has been "Tagged" with <code>MinVal</code>, which helps select the right semigroup. <code>MinVal(x: Int)</code> returns x with the type <code>Int @@ MinVal</code>. <code>x.some</code> is like <code>Some(x)</code> except the type is <code>Option</code> instead of <code>Some</code>, and this helps with type inference (there is a Semigroup for Option, but not for Some), similarly <code>none[T]</code> returns <code>None</code>, but its type is <code>Option[T]</code> instead of <code>None</code> (helpful for the same reasons, there is no Semigroup for None, but there is one for Option) If there are more than two, perhaps you have a list of these, you can use <code>suml</code>: <pre><code>scala> List(MinVal(2).some, None, MinVal(3).some, None, MinVal(1).some).suml res5: Option[scalaz.@@[Int,scalaz.Tags.MinVal]] = Some(1) </code></pre>
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1. POConditional map of Option[Int] pair through a function using scalaz
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1. PTAnswer
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1. USstew
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1. USstew
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1. POConditional map of Option[Int] pair through a function using scalaz
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1. COExcellent, that does the job! Thank you!
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