Quantad Quantad - 1 month ago 7
Scala Question

Scala: Call a method as part of the constructor

I have a class in Scala with two argument for its constructor:

class SomeClass (x:Int, y:Int) {
}


I need to expand the constructor so when an object of this class is initialized, some method is called, which uses the value of
x
defined in the primary constructor defaulted by Scala, and then outputs a value
z
:

def defineInputs(): Int = {
val z = x + 1
z
}


I want the value of
z
to be accessible publicly to all methods in the class, just like
x
and
y
are.

Can you please help me with this ?

Answer

You can simple defined a val inside the class, like so:

scala> :pa
// Entering paste mode (ctrl-D to finish)

class SomeClass(x: Int, y: Int) {
  val z = x + 1
}

new SomeClass(0, 0).z

// Exiting paste mode, now interpreting.

defined class SomeClass
res0: Int = 1

You could also use a case class:

scala> case class SomeClass(x: Int, y: Int) {
     |   val z = x + 1
     | }
defined class SomeClass

scala> SomeClass(0, 0).z
res0: Int = 1
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