#### 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

# Pattern search

So far, we've checked how to search for an element in an array or list. A string is also an array of characters, and we can apply different search algorithms to search for a character in a string. For example, searching for character t from the Kotlin string can be done using any of the aforementioned algorithms.

But what if we want to search for a pattern in a given string? For example, imagine that we need to search for the substring of in the string Kotlin is one of the best languages in the modern programming language world. In this case, both the input value and the pattern to be searched are strings themselves, so, the aforementioned algorithms will not work.

In this section, we'll understand how to search for a pattern in a string. Though it can be done in many ways, we'll discuss the four most-used pattern-search algorithms:

• Naive pattern...