“Cubes” a case class or tuple, i.e. for a tuple of type (T1, T2, ... , TN) generates all 2^N possible combinations of type (Option[T1], Option[T2], ... , Option[TN]).

This is useful for comparing some metric across all possible subsets.

For example, suppose we have a set of people represented as

case class Person(gender: String, age: Int, height: Double)

and we want to know the average height of

  • people, grouped by gender and age
  • people, grouped by only gender
  • people, grouped by only age
  • all people

Then we could do

import com.twitter.algebird.macros.Cuber.cuber
val people: List[People]
val averageHeights: Map[(Option[String], Option[Int]), Double] =
  people.flatMap { p => cuber((p.gender, p.age)).map((_,p)) }
    .mapValues { xs => val heights =; heights.sum / heights.length }

Documentation Help

We’d love your help fleshing out this documentation! You can edit this page in your browser by clicking this link. These links might be helpful: