Title: Set Operations On Sequences
Slug: set_operations_on_sequences
Summary: Set Operations On Sequences Using Scala.
Date: 2017-01-03 12:00
Category: Scala
Tags: Basics
Authors: Chris Albon

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

Preliminaries



In [21]:

    
import scala.collection.mutable.ArrayBuffer

Create Two Array Sequences



In [22]:

    
// 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



In [23]:

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









    Out[23]:





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



In [24]:

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









    Out[24]:





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

Union (All Elements) Of Two Sequences



In [25]:

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









    Out[25]:





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



In [26]:

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









    Out[26]:





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

Relative Complement Of Two Sequences



In [27]:

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









    Out[27]:





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