Learn to Program with Kotlin: From the Basics to Projects with Text and Image Processing

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2021

T. LaversLearn to Program with Kotlinhttps://doi.org/10.1007/978-1-4842-6815-5_8

8. Data Structures

Tim Lavers¹  

(1)

Woonona, NSW, Australia

 

Suppose that we go on a bird-watching expedition and want to keep a record of the birds that we see. We might wish to answer the following questions:

• What types of birds did we see?

• In what order did we see them?

• How many times were the different species seen?

In this chapter, we will look at the tools that Kotlin provides for answering these kinds of questions.

8.1 Lists

A List is a collection of objects that keeps track of the order in which they were added. Here is how we create a List of Strings:

val stringList = mutableListOf<String>() ...