# Set Operations On Sequences

If you want to learn more, check out Scala Cookbook and Programming in Scala.

## Preliminaries

import scala.collection.mutable.ArrayBuffer

## Create Two Array Sequences

// Create two arrays of ages val student_ages = ArrayBuffer(42,25,28,38,58,63,23,458,2569,584,25,25) val teacher_ages = ArrayBuffer(23,25,25,38,58,32,23,23,125,23,23,21,26)

## Concatenate Two Sequences

// Join two sequences end to end student_ages ++ teacher_ages

ArrayBuffer(42, 25, 28, 38, 58, 63, 23, 458, 2569, 584, 25, 25, 23, 25, 25, 38, 58, 32, 23, 23, 125, 23, 23, 21, 26)

## Intersection (Shared Elements) Of Two Sequences

// Create the interaction of two sequences teacher_ages.intersect(student_ages)

ArrayBuffer(23, 25, 25, 38, 58)

## Union (All Elements) Of Two Sequences

// Create the union of two sequences teacher_ages.union(student_ages)

ArrayBuffer(23, 25, 25, 38, 58, 32, 23, 23, 125, 23, 23, 21, 26, 42, 25, 28, 38, 58, 63, 23, 458, 2569, 584, 25, 25)

## Unique Elements In Union Of Two Sequences

// Create the union of two sequences then keep only the unique values teacher_ages.union(student_ages).distinct

ArrayBuffer(23, 25, 38, 58, 32, 125, 21, 26, 42, 28, 63, 458, 2569, 584)

## Relative Complement Of Two Sequences

// Elements in student_ages but not in teacher_ages student_ages diff teacher_ages

ArrayBuffer(42, 28, 63, 458, 2569, 584, 25)