Linked Questions

Why prefer composition instead of inheritance? What trade-offs are there for each approach? And the converse question: when should I choose inheritance instead of composition?

I was making my way through the Scala playframework tutorial and I came across this snippet of code which had me puzzled: def newTask = Action { implicit request => taskForm.bindFromRequest.fold( ...

Favor composition over inheritance is very popular phrase. I read several articles and at the end each article says use inheritance when there is pure IS-A relationship between classes. An example ...

I am new to JAVA and just started learning "IS-A" and "HAS-A" relation but I didn't really get it. What is the difference between "IS-A" and "HAS-A"? When ...

In Scala, we can use at least two methods to retrofit existing or new types. Suppose we want to express that something can be quantified using an Int. We can define the following trait. Implicit ...

Possible Duplicate: Prefer composition over inheritance? What is the difference between inheritance and delegation in java? How to use the following example in my project? Please can you guide me ...

I've stumbled upon this thread and there @prolativ provided some fancy scala 3 syntax for creating extension methods for objects extension (int: Int.type) def unapply(s: String): Option[Int] = s....

I am reading a Spark in Action book, I came across a construct that even after a while working with Scala I still can't understand. Here is the code (complete code) : First we have a case class where ...

I have a scenario where I would like to call sum on a sequence of (Double, Double) tuples. Ideally I would like to do something like the following: implicit def toTupleNumeric[T](num: Numeric[T]) = ...

I'm new in Scala Here's what I'm trying to understand This code snippet gives me RDD[Int], not give option to use toDF var input = spark.sparkContext.parallelize(List(1,2,3,4,5,6,7,8,9)) But when I ...