Introduction

This chapter will focus on explaining the advantages of range expressions and sequences. These powerful data structure concepts offered by the Kotlin standard library can help you to improve the quality and readability of your code, as well as its safety and performance. Range expressions provide a declarative way of iterating through sets of comparable types using for loops. They are also useful for implementing concise and safe control flow statements and conditions. The Sequence class, as a missing supplement to the Collection type, provides a built-in lazy evaluation of its elements. In many cases, using sequences can help optimize data-processing operations and make the code more efficient in terms of computation complexity and memory consumption. The recipes covered in this chapter are going to focus on solving real-life programming problems. Moreover, at the same time, they are also going to explain how those concepts work under the hood.