StackOverflow2013

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plurals

PO
primarykey
Id
18598941
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
2
CommunityOwnedDate
CreationDate
2013-09-03T18:17:31.140
FavoriteCount
0
LastActivityDate
2013-09-03T18:38:51.360
LastEditDate
2013-09-03T18:38:51.360
LastEditorUserId
390708
OwnerUserId
390708
ParentId
18598559
PostTypeId
2
Score
1
ViewCount
0
LastEditorDisplayName
text
Body
What is <code>a</code> or <code>b</code> assigned if an exception occurs? Wrap <code>a</code> and <code>b</code> in a <code>Try</code> to handle the exceptional cases. You can also pattern match on these to extract values. <pre><code>scala> class MyClass(val a: Try[String], val b: Try[String]) defined class MyClass scala> new MyClass(Try("foo"(0).toString), Try("foo"(3).toString)) res0: MyClass = MyClass@6bcc9c57 scala> res0.a res1: scala.util.Try[String] = Success(f) scala> res0.b res2: scala.util.Try[String] = Failure(java.lang.StringIndexOutOfBoundsException: String index out of range: 3) scala> res0.a.get res3: String = f scala> res0.b.get java.lang.StringIndexOutOfBoundsException: String index out of range: 3 at java.lang.String.charAt(String.java:658) ... </code></pre> Edits for comment. Uses default argumens for <code>a</code> and <code>b</code>. <code>null</code> is bad but that's what you asked for. See <a href="http://www.scala-lang.org/api/current/index.html#scala.Option" rel="nofollow">Option</a> <pre><code>class MyClass(val a: Try[String] = null, val b: Try[String] = null) scala> new MyClass(Success("a")) res50: MyClass = MyClass@625aaaca scala> res50.a res51: scala.util.Try[String] = Success(a) scala> res50.b res52: scala.util.Try[String] = null scala> new MyClass(b = Success("b")) res53: MyClass = MyClass@68157e85 scala> res53.a res54: scala.util.Try[String] = null scala> res53.b res55: scala.util.Try[String] = Success(b) </code></pre>
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Title
singulars
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1. This table or related slice is empty.
PostParentId
1. POCatch exception in Scala constructor
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1. PTAnswer
UserLastEditorUserId
1. USBrian
UserOwnerUserId
1. USBrian
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1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
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1. This table or related slice is empty.
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1. This table or related slice is empty.
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1. VO
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 VTUpMod
CommentsPostId
1. COIf an Object member is not set in the constructor, it defaults to `null`.
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 PO
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 USPaul Draper
2. COYou can use default arguments in the constructor. So that would become `class MyClass(val a: Try[String] = null, val b: Try[String] = null)`. I would discourage the use of `null` though. Look at the `Option` type or even just an empty `String`.
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