#### Overview of this book

Data structures and algorithms are more than just theoretical concepts. They help you become familiar with computational methods for solving problems and writing logical code. Equipped with this knowledge, you can write efficient programs that run faster and use less memory. Hands-On Data Structures and Algorithms with Kotlin book starts with the basics of algorithms and data structures, helping you get to grips with the fundamentals and measure complexity. You'll then move on to exploring the basics of functional programming while getting used to thinking recursively. Packed with plenty of examples along the way, this book will help you grasp each concept easily. In addition to this, you'll get a clear understanding of how the data structures in Kotlin's collection framework work internally. By the end of this book, you will be able to apply the theory of data structures and algorithms to work out real-world problems.
Preface
Free Chapter
Section 1: Getting Started with Data Structures
A Walk Through - Data Structures and Algorithms
Arrays - First Step to Grouping Data
Section 2: Efficient Grouping of Data with Various Data Structures
Understanding Stacks and Queues
Maps - Working with Key-Value Pairs
Section 3: Algorithms and Efficiency
Deep-Dive into Searching Algorithms
Understanding Sorting Algorithms
Section 4: Modern and Advanced Data Structures
Collections and Data Operations in Kotlin
Introduction to Functional Programming
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Assessments

# Understanding a group of ordered elements – List, MutableList

List is one of the most commonly used collection data types. It is an implementation of the collection to work with a group of ordered data.

The data in a list may be ordered based on when it was added (for example if we add 3 after 4 to an Int list, then 4 will appear in the list before 3, much like an array) or we may even ordered them with ordering/sorting algorithms.

The following is a list of the most important functions defined in the List interface:

• fun get(index: Int):E: This method is used to get an element from the list at the given index.
• fun indexOf(element: @UnsafeVariance E):Int: This method is useful to identify the index of an element in the list. This method should search for the specified element inside the whole list and should return the position of the element if it's in the list...