Scala and Spark for Big Data Analytics

Traversable

Traversable is the root of the collections' hierarchy. In Traversable, there are definitions for a wide range of operations that the Scala Collections API offers. There is only one abstract method in Traversable, which is the foreach method.

def foreach[U](f: Elem => U): Unit

This method is essential to all the operations contained in Traversable. If you have studied data structures, you will be familiar with traversing a data structure's elements and executing a function on each element. The foreach method does exactly so that, it traverses the elements in the collection and executes a function f on each element. As we mentioned, this is an abstract method and it was designed to have different definitions according to the underlying ...