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Assign generic method to variable in Scala


Assign generic method to variable in Scala

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Assign generic method to variable in Scala
Tag : scala , By : Tony Siu
Date : December 01 2020, 04:55 PM


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Scala initialize a collection type variable to null outside a for loop and assign some method's return value to the vari


Tag : scala , By : Hadley
Date : March 29 2020, 07:55 AM
will help you I'm not entirely sure what your actual goal is. I guess what you are trying to achieve seem to be better solved by filter and map:
filter serves as validator in this case, i.e., people.filter(isFirstNameValid). This returns a collection of all people with a defined first name -- is this what you want? map serves as extractor of the desired field, in this case the first name. So overall people.filter(isFirstNameValid).map(_.firstName) in case you want your collection to represent first names instead of a complete person. If you furthermore want to convert from Option (of first name) to a concrete value you may want to use flatMap instead (this also makes the explicit validation unnecessary).

TypeScript Generic Classes: Cannot assign to Generic Type Variable


Tag : generics , By : Mark
Date : March 29 2020, 07:55 AM
I wish this help you I'm trying to use Generic interfaces for my classes. My Class has a generic Type which Extends an interface and a class variable with that Type. But as soon as I try to assign a value to that variable the compiler gives me an error.(Example: Class A)
class A<IState extends MyStateInterface> {
    protected state: IState;

    constructor() {
        this.state = { ...
interface MyCoolState extends MyStateInterface {
  required: string;
}
let x = new A<MyCoolState>();

In Java is it possible to assign a method reference to a variable whose class has a generic type?


Tag : java , By : amorican
Date : March 29 2020, 07:55 AM
Does that help Let's say we've got the following classes:
public void onServiceEvent(ServiceEvent event) {}
EventListener<ServiceEvent> listener = service::onServiceEvent;
EventListener<? extends Event> anotherListener

Assign a value to an attribute of a generic method of a generic class - Java


Tag : java , By : Nandor Devai
Date : March 29 2020, 07:55 AM
wish helps you You were close. You need two generic types: a type for your object (bean), and a type for the value. You want a BiConsumer, not a Function, because a set-method does not return anything.
public static <T, V> T assignValueToAttribute(T obj, BiConsumer<T, V> attributeSetter, V value) {
    attributeSetter.accept(obj, value);
    return obj;
}
assignValueToAttribute(myCar, Car::setColor, "red");

Calling Java Generic Typed Method from Scala gives a Type mismatch error : Scala


Tag : java , By : Matt Leacock
Date : March 29 2020, 07:55 AM
should help you out Welcome to SO.
This seems to compile, but I am not sure if it works with the real implementation of JavaClass, but I am pretty sure it should.
import scala.reflect.ClassTag

object ScalaClass {
  def toArray[T <: AnyRef](coll: java.util.Collection[T])(implicit ct: ClassTag[T]): Array[T] =
    JavaClass.toArray[T](ct.runtimeClass.asInstanceOf[Class[T]], coll)
}
val col: java.util.Collection[String] = ???

val array: Array[String] = ScalaClass.toArray(col)
object ScalaClass {
  def toArray[T <: AnyRef](t: java.lang.Class[T], coll: java.util.Collection[T]): Array[T] =
    JavaClass.toArray[T](t, coll)
}
val col: java.util.Collection[String] = ???

val array: Array[String] = ScalaClass.toArray(classOf[String], col)
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