splitat

How to split sequences into subsets in Scala (groupBy, partition, splitAt, span)

This is an excerpt from the Scala Cookbook (partially modified for the internet). This is Recipe 10.19, “How to Split Scala Sequences into Subsets (groupBy, partition, etc.)”

Problem

You want to partition a sequence into two or more different sequences (subsets) based on an algorithm or location you define.