samidarko samidarko - 1 year ago 80
Scala Question

Scala inheritance : how to pass a parameter to parameter without declaring it in child?

I would like to initialise a parent object that needs a parameter but without declaring in child constructor

class A(name: String)

What I see everywhere is

class B(name: String) extends A(name)

but what I would like to do is

class B extends A {
def this() = this("valueOfName") // string "valueOfName" is passed to A

Is it possible to do this in Scala?

** EDIT **

This is just a toy example, my real case is more complex, but I want to transform the parameter passed to the parent:

class B(other: String) extends A {
def this() = this(other ++"valueOfName")

Answer Source

Just pass the value directly to the constructor of A. Like this:

class B extends A("valueOfName")
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