Scala and Spark for Big Data Analytics

Seq, LinearSeq, and IndexedSeq

A sequence has some differences from the usual Iterable, and it has a defined length and order. Seq has two sub-traits such as LinearSeq and IndexedSeq. Let's have a quick overview on them.

LinearSeq is a base trait for linear sequences. Linear sequences have reasonably efficient head, tail, and isEmpty methods. If these methods provide the fastest way to traverse the collection, a collection Coll that extends this trait should also extend LinearSeqOptimized[A, Coll[A]]. LinearSeq has three concrete methods:

• isEmpty: This checks if the list is empty or not
• head: This returns the first element in the list/sequence
• tail: This returns all the elements of the list but the first one. Each of the subcollections that ...