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Unable to call function via companion object


Unable to call function via companion object

By : user2956849
Date : November 22 2020, 03:03 PM
I hope this helps you . Because the method you are trying to call is not a member of the companion, use:
code :
val x = Test()
x.callMe()


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Why can't I call function on companion object?

Why can't I call function on companion object?


By : Michael Wolf
Date : March 29 2020, 07:55 AM
I wish this help you In the code below, why can't I call the sum function when I create an instance of fpinscala.datastructures.List? I.e. in the SBT console I do the following: , First, note that this line:
code :
val list = fpinscala.datastructures.List(2,3)
val list = fpinscala.datastructures.List.apply(2,3)
Create a companion object that mixes in a trait that defines a method which returns an object of the object's companion

Create a companion object that mixes in a trait that defines a method which returns an object of the object's companion


By : Marcin Sz
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Abstract problem: Create a trait that can be mixed into the companion object of a class, to give that object a method that returns an object of that class. , The solution is to simplify the type parameter for the trait.
code :
trait DeserializeFromJson[T] { 
  def fromJson( json : String )(implicit m : Manifest[T]) : T = 
    JSON.parser.fromJson[T](json)(m)
}
Unable to create companion class instance in companion object method

Unable to create companion class instance in companion object method


By : KAMLESH KUMAR
Date : March 29 2020, 07:55 AM
wish helps you Wrong syntax (You are using Java syntax) for object creation. In case of Scala you need not mention the type in front of the variable t it will be automatically inferred.
code :
Trivials t = new Trivials("Trivials")
val t = new Trivials("Trivials")
Unit Testing verifying a companion object method is called (mocking a companion object)

Unit Testing verifying a companion object method is called (mocking a companion object)


By : Edward Neal
Date : March 29 2020, 07:55 AM
To fix the issue you can do When switching to Kotlin, static methods are moved into a companion object. However, there is no obvious way to unit test other methods which call these "static method". , Solution 1 : add a caller function in the calling class
code :
public class DummyWrapper {
val foo get() = DummyCompanion.Companion

public void callAStaticMethod(){
    foo.staticMechod();
}

public void callCompanionMethod(){
    foo.someCompanionMethod();
}
}
@Test
fun testCase{
....
val mockCompanionObj: DummyCompanion.Companion = mock()
val wrapper = DummyWrapper()

whenever(wrapper.foo).thenReturn(mockCompanionObj)
wrapper.callCompanionMethod()
verify(mockCompanionObj).someCompanionMethod()
....
}
 @Test
 fun testCompanionObject() {
    //Mock the companion object
    mockkObject(DummyCompanion.Companion)

    //define the stubbing bechavior of a companion object method
    every { DummyCompanion.Companion.companionMethod() } answers { stubMethod() }

    val testObject = DummyWrapper()

    //Call a method that calls the companion object method
    //You can verify stubMethod() is called
    testObject.callCompanionMethod()

    verify(exactly = 1) { DummyCompanion.someCompanionMethod() }
}
Is there a way to make companion object function private and import the companion object to the class and then access th

Is there a way to make companion object function private and import the companion object to the class and then access th


By : user3622223
Date : March 29 2020, 07:55 AM
this one helps. According to docs
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