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In the Scala code below, I need to fill in the ??? How should I implement a mutable private state variables in one of the functions to hold the count
object Counter:
def resetCount(): Unit = ???
def getCount: Int = ???
def incCount(): Unit = ???
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Consider the following list(1,1,2,2,3,4,4,5,5) I want to print only 3. Since it is the unique one. Can someone help me with the Scala code.
It's not a Spark question, but this function would do it for Scala
def uniqueElems[T](lst: Seq[T]) = {
lst.groupBy(identity).collect { case v if v._2.length == 1 => v._2.head }
}
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I have a trait like this:
trait MyBag[A]{
def add(elem: A): This
}
What is the :This return type? Does this mean the add function returns an instance of MyBag?
This is just the name of a type that is defined somewhere else that you are not showing us. The compiler doesn't speak English, it doesn't care whether a type is named This or Foo or Fgjbgjzdz55437365643w.
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I want instance's array just like as follow;
var ExampleObj = List(10)(new Obj)
Then I want to use this as;
var (hoge0, hoge1) = ExampleObj(2)(foo0, foo1, foo2)
The (new Obj) makes type mismatch.
[error] found : unittest.Obj
[error] required: Int
I do package unittest for Obj class.
What I make misunderstand ?
Could you please point out that point and how to solve it ?
If I understood your question correctly, you're trying to create a List with 10 instances of Obj class?
It can be done using fill method, like that:
List.fill(10)(new Obj)
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Problem picture
Can anyone tell me what this means:
A = (rs: WrappedResultSet) => throw new IllegalStateException ("The extractor isn't specified yet.")
def fun[A](extractor: WrappedResultSet => A = (rs: WrappedResultSet) => throw new IllegalStateException("The extractor isn't specified yet.")): A
It means that method fun which takes generic type parameter A and a function called extractor of type WrappedResultSet => A. If no value of extractor is passed to fun, then fun uses the default behavior which is to throw IllegalStateException as shown in the code above.
Let me know if it helps!!
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I have java code shown below, how to convert it to scala?
feature.getFeatures()
.stream()
.filter(a -> a.getFeatureName().equals(feature))
.findFirst()
.map(f -> f.Accounts().contains(accountId))
.orElse(true);
Whenever you see filter or find chained with map, think collect or collectFirst
So something like this should work:
feature.getFeatures()
.collectFirst {
case f if f.getFeatureName().equals(feature) =>
f.Accounts().contains(accountId)
}.getOrElse(true)